beat

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Related to beat a hasty retreat: beat out, beat the pants off, beats me

beat

1. Physics the low regular frequency produced by combining two sounds or electrical signals that have similar frequencies
2. Prosody the accent, stress, or ictus in a metrical foot
3. Nautical a course that steers a sailing vessel as close as possible to the direction from which the wind is blowing
4. 
a. the act of scouring for game by beating
b. the organized scouring of a particular woodland so as to rouse the game in it
c. the woodland where game is so roused
5. Fencing a sharp tap with one's blade on an opponent's blade to deflect it

Beat

A variation in the intensity of a composite wave which is formed from two distinct waves with different frequencies. Beats were first observed in sound waves, such as those produced by two tuning forks with different frequencies. Beats also can be produced by other waves. They can occur in the motion of two pendulums of different lengths and have been observed among the different-frequency phonons in a crystal lattice.

One important application of beat phenomena is to use one object with an accurately known frequency to determine the unknown frequency of another such object. The beat-frequency or heterodyne oscillator also operates by producing beats from two frequencies.

beat

[bēt]
(physics)
The periodic variation in amplitude of a wave that is the superposition of two simple harmonic waves of different frequencies.

beat

i. A low-frequency vibration produced when two sources of vibration act on the same object at the same time. For example, in a multiengine airplane, if two engines have slightly different RPM, airframe vibrations produced by these engines will produce a very noticeable beat.
ii. When two waves are combined or superimposed, a beat occurs if two frequencies are not the same. Waves beat together to create the appearance of either a change in amplitude, if the frequencies differ by a few hertz (Hz), or new frequencies, called beat frequencies or heterodynes, if the original frequencies are far apart.
References in periodicals archive ?
Similarly, when the Orwellian nature of the so-called Total Information Awareness (TIA) program was exposed, the Bush administration beat a hasty retreat and pulled many of the TIA pages from the Department of Defense website.
The Highlanders regiment beat a hasty retreat after the band's lawyers ordered them to remove the songs Wonderwall and Hello from the soundtrack or face legal action.
Sometimes the confusion even causes parents to beat a hasty retreat by forestalling the decision and not sending the child to camp in the intended year.
Now that pledge is being put to the test and once again, AOL has beat a hasty retreat.
With the nation's (and his own) manhood at stake, Clinton beat a hasty retreat from the whole issue and hasn't dared mention gays in public since.
Carson's strategy beat a hasty retreat from that of his ambitious predecessor, Joseph J.
Barring that buildup of calls at the 80 strike, it seems that everyone else is betting on the equity to beat a hasty retreat.
Two hours after he arrived there he had to beat a hasty retreat to get back to London in time to witness the birth of 7lb 13oz Eli Alfred Michael Evans.
While most celebs would have beat a hasty retreat from motormouth Morgan, Madonna's "people" unleashed the powers of PR in a bid to turn the joke on him.