trip-wire noun. ['trɪpwʌɪǝ] Also tripwire. E20.
[from TRIP noun¹ or verb + WIRE noun.]
1. A wire stretched close to the ground in order to trip up enemies, trespassers, etc., or operate a weapon or alarm. E20.

2. fig. A comparatively weak military force employed as a first line of defence, engagement with which will trigger the intervention of stronger forces. M20.

[TahlilGaran] English Dictionary ▲