booby trap

a hidden bomb or mine so placed that it will be set off by an unsuspecting person through such means as moving an apparently harmless object.
any hidden trap set for an unsuspecting person.

1840–50 Unabridged


verb (used with object), booby-trapped, booby-trapping.
to set with or as if with a booby trap; attach a booby trap to or in.

1940–45 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
booby trap
1.  a hidden explosive device primed in such a way as to be set off by an unsuspecting victim
2.  a trap for an unsuspecting person, esp one intended as a practical joke, such as an object balanced above a door to fall on the person who opens it
vb , booby-trap, traps, -trapping, -trapped
3.  (tr) to set a booby trap in or on (a building or object) or for (a person)

Collins English Dictionary - Complete & Unabridged 10th Edition
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