Definition of trip wire
1 : a low-placed concealed wire used especially in warfare to trip an enemy or trespasser and usually to trigger an alarm or explosive device when moved
2 : something (such as a small military force) intended to function like a trip wire (as to set a larger military force in motion)
First Known Use of trip wire
Learn More about trip wire
Seen and Heard
What made you want to look up trip wire? Please tell us where you read or heard it (including the quote, if possible).