Definition: to become tighter or to make something become tighter Level: B2
他的手紧紧抓住了她的手臂。
His hand ___tightened around her arm.
收紧带子，以免它们摩擦。
___Tighten the straps so they don't rub.
当他挣扎时，绳子收得更紧了。
As he struggled, the ropes ___tightened even more.
