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bug,common name correctly applied to insects belonging to the order Hemiptera, although members of the order Homoptera (e.g., mealybugmealybug,
common name for certain unarmored scale insects that exude a granular white secretion, giving them a mealy appearance. Many are common greenhouse and crop pests. Adult females are wingless, with oval, segmented bodies and well-developed legs.
..... Click the link for more information. ) are sometimes referred to as bugs, as are other insects in general. The true bugs (Hemipterans) have a characteristic pair of front wings that are partially thickened and darkened at the base and partially membranous at the apex. Development is gradual through an incomplete metamorphosismetamorphosis
[Gr.,=transformation], in zoology, term used to describe a form of development from egg to adult in which there is a series of distinct stages. Many insects, amphibians, mollusks, crustaceans, and fishes undergo metamorphosis, which may involve a change in habitat,
..... Click the link for more information. with a number of nymphal stages before the reproductively mature adult stage is reached. Most bugs are terrestrial, but many are aquatic (e.g., various water bugswater bug,
name for a large number of water-living bugs, comprising several families of the order Hemiptera (true bugs). All have jointed, sharp, sucking beaks, breathe air, and undergo gradual metamorphosis (see insect).
..... Click the link for more information. ).
Although bugs vary greatly in size, color, and physical appearance, they all have piercing-sucking mouthparts in the form of a jointed beak. Most species suck plant juices (e.g., the squash bugsquash bug,
name for a true bug, Anasa tristis, found throughout the United States and S Canada. It damages squash, pumpkin, and related plants by sucking the juices from leaves and stems. The adult is dark brown and measures about 2-3 in. (16 mm) long.
..... Click the link for more information. and chinch bugchinch bug,
small North American bug, Blissus leucopterus, of the seed bug family. It feeds on small grains, corn, and other grasses, sucking the plant juices and doing much damage to crops, particularly in the Midwest. The adults, about 1/8 in. (3.
..... Click the link for more information. ); however, some suck the blood of other insects and spiders (e.g., the assassin bugassassin bug,
common name for members of the family Reduviidae, one of the largest and most varied groups belonging to the order Hemiptera (suborder Heteroptera). Assassin bugs are generally brownish to black, medium-sized to large insects, with heads that are elongate and
..... Click the link for more information. and backswimmerbackswimmer,
common name for water bugs of the cosmopolitan family Notonectidae, so named because they swim upside down, usually near the surface of the water. They have oval bodies and long, oarlike hind legs, with which they swim rapidly, but their backs are more convex than
..... Click the link for more information. ). Others, such as the bedbugbedbug,
any of the small, blood-sucking bugs of the family Cimicidae, which includes about 30 species distributed throughout the world. Bedbugs are flat-bodied, oval, reddish brown, and about 1-4 in. (6 mm) long.
..... Click the link for more information. , feed on people and other animals. Many of these insects characteristically secrete defensive substances (e.g., the stink bugstink bug,
member of a large, widely distributed family (Pentatomidae) of true bugs with flattened, shield-shaped bodies. Most are 1-4 to 1-2 in. (6–12 mm) long. Those species whose hard upper covering, or scutellum, covers most of the abdomen are known as shield bugs, as
..... Click the link for more information. ). The true bugs are classified in the phylum ArthropodaArthropoda
[Gr.,=jointed feet], largest and most diverse animal phylum. The arthropods include crustaceans, insects, centipedes, millipedes, spiders, scorpions, and the extinct trilobites.
..... Click the link for more information. , class Insecta, order Hemiptera.
Southern Bug,river, Ukraine: see BuhBuh
or Southern Buh
, Ukr. Pivdynnyy Buh, river, c.490 mi (790 km) long, rising in the Volhynian-Podolian hills, W Ukraine. The Buh, flowing generally SE into the Black Sea, is navigable for c.100 mi (160 km) from Voznesensk to its mouth.
..... Click the link for more information. .
Bug(bo͞og, bŭg), Pol. Bug, Ukr. Buh or Zakhidnyy Buh, river, c.480 mi (770 km) long, rising in the Volhynian-Podolian hills, W Ukraine. It flows N along the Polish-Ukrainian and Polish-Belarusian borders past Brest and then NW through Poland to join the Vistula River (with the Narew) near Warsaw. It is linked with the Dnieper by the Dnieper-Bug Canal via the Pina River and with the Niemen by the Augustov Canal via the Narva River. The Bug is also known as the Western Bug.
or Zapadnyi Bug, a river in the USSR and Poland (marking the border over a considerable distance), right tributary of the Vistula. Length, 831 km; area of basin, 73,470 sq km.
The Bug rises in the Podol’e Upland in Lvov Oblast, Ukrainian SSR. It flows at the western edge of the Lublin Upland and Podlasie. It has high water during spring and autumn flooding, which is caused by rain. There are frequent winter floods caused by the thaw of snow. The water is highest in March and April and lowest usually in September. The river freezes in late December and the ice breaks in the second half of March. The most important tributaries are the Mukhavets River, which is linked by the Dnieper-Bug Canal with the Pina River (tributary of the Pripiat’) belonging to the Dnieper system, and the Narew River; the Biebrza River, a tributary of the Narew, is linked through the Netta River by the Augustów Canal with the Czarna Hancza River, which flows into the Neman River. The Bug is navigable up to a distance of 315 km from its mouth. The main cities on the Bug are Brest, Sokal’, Chervonograd, Kamenka-Bugskaia, and Busk.
Admiral Grace Hopper (an early computing pioneer better known for inventing COBOL) liked to tell a story in which a technician solved a glitch in the Harvard Mark II machine by pulling an actual insect out from between the contacts of one of its relays, and she subsequently promulgated bug in its hackish sense as a joke about the incident (though, as she was careful to admit, she was not there when it happened). For many years the logbook associated with the incident and the actual bug in question (a moth) sat in a display case at the Naval Surface Warfare Center (NSWC). The entire story, with a picture of the logbook and the moth taped into it, is recorded in the "Annals of the History of Computing", Vol. 3, No. 3 (July 1981), pp. 285--286.
The text of the log entry (from September 9, 1947), reads "1545 Relay #70 Panel F (moth) in relay. First actual case of bug being found". This wording establishes that the term was already in use at the time in its current specific sense - and Hopper herself reports that the term "bug" was regularly applied to problems in radar electronics during WWII.
Indeed, the use of "bug" to mean an industrial defect was already established in Thomas Edison's time, and a more specific and rather modern use can be found in an electrical handbook from 1896 ("Hawkin's New Catechism of Electricity", Theo. Audel & Co.) which says: "The term "bug" is used to a limited extent to designate any fault or trouble in the connections or working of electric apparatus." It further notes that the term is "said to have originated in quadruplex telegraphy and have been transferred to all electric apparatus."
The latter observation may explain a common folk etymology of the term; that it came from telephone company usage, in which "bugs in a telephone cable" were blamed for noisy lines. Though this derivation seems to be mistaken, it may well be a distorted memory of a joke first current among *telegraph* operators more than a century ago!
Actually, use of "bug" in the general sense of a disruptive event goes back to Shakespeare! In the first edition of Samuel Johnson's dictionary one meaning of "bug" is "A frightful object; a walking spectre"; this is traced to "bugbear", a Welsh term for a variety of mythological monster which (to complete the circle) has recently been reintroduced into the popular lexicon through fantasy role-playing games.
In any case, in jargon the word almost never refers to insects. Here is a plausible conversation that never actually happened:
"There is a bug in this ant farm!"
"What do you mean? I don't see any ants in it."
"That's the bug."
[There has been a widespread myth that the original bug was moved to the Smithsonian, and an earlier version of this entry so asserted. A correspondent who thought to check discovered that the bug was not there. While investigating this in late 1990, your editor discovered that the NSWC still had the bug, but had unsuccessfully tried to get the Smithsonian to accept it - and that the present curator of their History of American Technology Museum didn't know this and agreed that it would make a worthwhile exhibit. It was moved to the Smithsonian in mid-1991, but due to space and money constraints has not yet been exhibited. Thus, the process of investigating the original-computer-bug bug fixed it in an entirely unexpected way, by making the myth true! - ESR]
bugA persistent error in software or hardware. If the bug is in software, it can be corrected by changing the program code. If the bug is in hardware, a new circuit has to be designed, and the erroneous chip has to be replaced.
Although the derivation of bug is generally attributed to a moth that was found squashed between the relays of Harvard University's Mark II electromechanical calculator in the 1940s, the term actually goes back to the 1800s to refer to flaws in mechanical systems. See buggy, bug fix, software bug, broken, Heisenbug and Web bug. Contrast with glitch.
A Note from the Author
On October 19, 1992, I found my first "real bug." When I fired up my laser printer, it printed blotchy pages. Upon inspection, I found a bug lying belly up in the trough below the corona wire. The printer worked fine after removing it!