rachet
/ˈrætʃɪt/
noun
- A device consisting of a bar or wheel with angled teeth that allows motion in only one direction, often used in tools and machinery.
- A simple rachet mechanism keeps the car's parking brake engaged.
- He used a rachet to tighten the bolt without having to reposition the tool.
- The rachet on the winch prevented the rope from slipping backward.