"Tighten the wire"
"The rope tightened"
"Tighten the rules" "stiffen the regulations"
"reduce the influx of foreigners"
The strings are tightened..to produce a musical note when struck.
The illness tightened its grip.
牛津高阶第八版
美国韦氏词典
Dictionary.com
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维基百科 (自由的百科全书)