ratchet

英 ['r?t??t] 美['r?t??t]

暢通詞匯

復(fù)數(shù):?ratchets;

ratchet 防止倒轉(zhuǎn)的棘輪

來(lái)自法語(yǔ) rochet,線軸，紡錘，詞源同 rock,rocket.引申詞義棘輪。插入字母 t,比較 bake,batch.

ratchet: 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."

1. He fears inflation will ratchet up as the year ends.: 他害怕通貨膨脹會(huì)在年終更加嚴(yán)重。

2. A ratchet mechanism transfers the thread from spool to bobbin.: 一種棘齒裝置把線從線軸轉(zhuǎn)到梭心上。

3. The chair has a ratchet below it to adjust the height.: 這把椅子下面有棘輪調(diào)整高度。

5. Obviously, the regular crimp wave provides a mechanism for short - range entanglement of the ratchet type.: 雖然, 有規(guī)則的卷曲波紋能使纖維間短片段內(nèi)彼此糾纏接觸,產(chǎn)生棘輪式機(jī)械作用.