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ratchet[ratchet 词源字典]

ratchet: [17] Ratchet was originally acquired, in the form rochet, from French rochet. This was a diminutive form descended ultimately from Frankish *rokko ‘spool’, which is related to English rocket. The notion of having teeth, which is central to the idea of a ratchet, therefore appears to be historically secondary; it presumably arose from the addition of ‘teeth’ to a rotating ‘spool’ or ‘spindle’ in a machine. The change from rochet to ratchet, which began in the 18th century, may have been influenced by German ratsch ‘ratchet’.
=> rocket[ratchet etymology, ratchet origin, 英语词源]