ratchet
[ˈrætʃɪt]
n.
（防倒转的）棘齿;
vt.
安装棘轮于；松脱;
把…造成棘齿形，于…作棘齿，在…上刻锯齿;
例句:
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A ratchet mechanism transfers the thread from spool to bobbin.
一种棘齿装置把线从线轴转到梭心上。
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He fears inflation will ratchet up as the year ends.
他害怕通货膨胀会在年终更加严重。
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The chair has a ratchet below it to adjust the height.
这把椅子下面有棘轮调整高度。
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But the problem with special offers is the ratchet effect.
来自THETIMES
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He urged North Korea to ratchet down what he called this very dangerous rhetoric.
来自VOA
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Both parties, in any case, have continued to ratchet up the partisanship.
来自NEWYORKER