tripwire

[ trip-wahyuh r ]
/ ˈtrɪpˌwaɪər /

noun

a wire used to set off concealed explosives, as one stretched across a footpath to be struck and activated by the foot of an enemy soldier.
a wire that activates a trap, camera, or other device when stepped on, tripped on, or otherwise disturbed.

Origin of tripwire

Example sentences from the Web for tripwire

British Dictionary definitions for tripwire

tripwire
/ (ˈtrɪpˌwaɪə) /

noun

a wire that activates a trap, mine, etc, when tripped over