rachet

Từ điển WordNet v3.1 - WordNet Dictionary

noun

mechanical device consisting of a toothed wheel or rack engaged with a pawl that permits it to move in only one direction
• Syn:
ratchet, ratch
• Derivationally related forms:
ratchet (for: ratchet)
• Hypernyms:
mechanical device
• Part Holonyms:
spiral ratchet screwdriver, ratchet screwdriver
• Part Meronyms:
pawl, detent, click, dog, ratchet wheel