noun
Etymology: booby (I)
1. : a trap for the unwary or unsuspecting:
a. : a trap laid to play a trick on an unwary person
booby traps with buckets of water suspended over doors — Robert Graves
b. : a concealed explosive device usually attached to some harmless-looking object
the booby trap exploded when he touched the doorknob
c. : an object wired to set off an explosion when touched
the car, which they suspected might be a booby trap — Combined Operations
2. : a critical or potentially dangerous aspect (as of a problem or situation) : pitfall
words and expressions which are booby traps when used in the other language — Richard Joseph