booby trap
From Longman Dictionary of Contemporary EnglishRelated topics: Weaponsbooby trapˈbooby trap, booby-trap noun [countable] 1 PMWa hidden bomb that explodes when you touch something else that is connected to it He lost both legs in a booby trap bomb blast.2 JOKEa harmless trap that you arrange for someone as a joke —booby-trapped adjective —booby trap verb [transitive]Examples from the Corpusbooby trap• We must have moved all of a foot and a half before we hit a booby trap.