ratchet
🇺🇸
/ˈrætʃɪt/
🇬🇧
/ˈrætʃɪt/
A device that allows movement in one direction but not the other, often used in machinery.
The ratchet mechanism in the wrench ensures that the bolt tightens securely.
扳手裡的棘輪機制確保螺釘能安全地繃緊。