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booby trap[′büb·ē ‚trap]
An explosive charge such as a mine, grenade, demolition block, shell, or bulk explosive fitted with a detonator and a firing device, and usually concealed and set to explode when an unsuspecting person touches off its firing mechanism by stepping upon, lifting, or moving a harmless-looking object.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.