noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   One who, or that which, prevents.
2. 2
   An arrangement, made with ropes and blocks, that prevents the boom of a sailing boat from performing a jibe.
3. 3
   Any of various lines set up to reinforce or relieve ordinary running or standing rigging.

Antonyms

All antonyms

cause

Etymology

From prevent + -er.

Related phrases

blowout preventer

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.