trip-wire (iou) and Goalkeeper - Water Polo (gambling)

trip-wire (iou)

trip-wire noun. Also tripwire. E20.
[from TRIP noun1 or verb + WIRE noun.]
A wire stretched close to the ground in order to trip up enemies, trespassers, etc., or operate a weapon or alarm. E20.
fig. A comparatively weak military force employed as a first line of defence, engagement with which will trigger the intervention of stronger forces. M20.

Goalkeeper - Water Polo (gambling)

Each team has a goalkeeper, who must remain behind the half-distance line. The goalkeeper alone is allowed to stand or walk on the floor of the pool, to jump from the floor of the pool, to use both hands on the ball, and to punch the ball.

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