a wheel or bar with teeth along the edge and a metal piece that fits between the teeth, allowing movement in one direction only （防止倒转的）棘轮，棘齿 
Word Originmid 17th cent.: from French rochet, originally denoting a blunt lance head, later in the sense ‘bobbin, ratchet’; related to the base of archaic rock ‘quantity of wool on a distaff for spinning’.
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ratchet
verbVerb Forms
Phrasal Verbs| present simple I / you / we / they ratchet | |
| he / she / it ratchets | |
| past simple ratcheted | |
| past participle ratcheted | |
| -ing form ratcheting |
ratchet
Parts of machines and machinery: ancillary, ball bearing, bearing...
To increase, or to increase something: increase, go up, add to...
To reduce something: cut back, cut down, reduce...
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