make or become tight or tighter
(使)变紧;(使)绷紧;(使)变得更严格
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[with obj.]
central government has tightened control over local authority spending 中央政府已经加强了对地方当局支出的控制
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[no obj.]
the revenue laws were tightening up .税收律法更加严格。
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tighten one's belt 见BELT .tighten the screw 见SCREW .