1. things or people that prevent something from happening
2. additional ropes or chains used to secure rigging on a ship
Usage: nautical

Examples

• Fire preventers are installed throughout the building.
• The doctor recommended several disease preventers.
• Crime preventers include better lighting and security cameras.
• The sailors secured the preventers before the storm hit.
• These safety devices act as accident preventers.
• The ship’s preventers held firm during rough seas.