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 (v.)
1852, from ratchet (n.). Transferred sense attested by 1977. Related: Ratcheted; ratcheting.
ratchet (n.)
1650s, rochet, from French rochet "bobbin, spindle," from Italian rocchetto "spool, ratchet," diminutive of rocca "distaff," possibly from a Germanic source (compare Old High German rocko "distaff," Old Norse rokkr), from Proto-Germanic *rukka-, from PIE root *ruk- "fabric, spun yarn." Compare rocket (n.2). Current spelling in English dates from 1721, influenced by synonymous ratch, which perhaps is borrowed from German R?tsche "ratchet."
例文
1. He fears infration will ratchet up as the year ends.
彼はインフレが年末にさらに深刻になることを恐れている。
2.A ratchet mechanism transfers the thread from spool to bobbin.
ラチェット装置は糸をスプールからボビンに回転させる。
3.The chair has a ratchet below it to adjust the height.
この椅子の下にラチェット調整高さがあります。
4.We 're trying to ratchet down the administrative costs.
管理コストの制御を考えています。
5.Obviously，the regular crimp wave provides a mechanism for short-range entanglement of the ratchet type.