crack

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crack:

see cocainecocaine
, alkaloid drug derived from the leaves of the coca shrub. A commonly abused illegal drug, cocaine has limited medical uses, most often in surgical applications that take advantage of the fact that, in addition to its anesthetic effect, it constricts small arteries,
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The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/

What does it mean when you dream about cracks?

Can represent a flaw or weakness. A crack in a dream could be drawing on the meaning of an idiom, such as “papering over the cracks,” “cracking up,” or “falling through the cracks.”

The Dream Encyclopedia, Second Edition © 2009 Visible Ink Press®. All rights reserved.

crack

[krak]
(chemistry)
To break a compound into simpler molecules.
(engineering)
To open something slightly, for instance, a valve.
(science and technology)
A fissure.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

crack

A building defect consisting of complete or incomplete separation within a single element or between contiguous elements of constructions.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

crack

1. a break or fracture without complete separation of the two parts
2. a physical or mental defect; flaw
3. a broken or cracked tone of voice, as a boy's during puberty
4. Slang a processed form of cocaine hydrochloride used as a stimulant. It is highly addictive
5. Obsolete slang a burglar or burglary
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

crack

To break into. See cracker.
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References in periodicals archive ?
Susann pops pills (she's "on everything but roller skates"), cracks wise, cuddles French poodle Josephine and taps away at her pink typewriter.
But Miller is inexcusably bland, even as he cracks wise while dispatching bloodsuckers, and Butler's Dracula seems more like a peevish male model than a true prince of darkness.
Slender and fit, he grins behind trademark aviator spectacles and cracks wise when Williams suggests Lee's new superhero tales boast the same kind of complex and compelling characters that won him legions of devotees at Marvel Comics.