Nautical. More fully preventer rope. A rope used (esp. temporarily) to strengthen or duplicate a stay or other piece of rigging in order to…

Nautical. A preventer-rope made fast so as to prevent a yard, mast, etc. from jumping or springing up in rough weather. Also attributive.

(a) a strap adjusted to prevent a horse from kicking; also figurative; (b) Nautical a rope lanyard fixed to the boom to prevent it from rising.