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1·His hold on her arm tightened.

他把她的胳膊抓得更紧了。《牛津词典》

2·She tightened her grip on his arm.

她抓他的手臂抓得更紧了。《牛津词典》

3·She tightened her belt an extra notch.

她将腰带又束紧了一格。《牛津词典》

4·Her arms tightened about his neck in gratitude.

她的双臂紧紧搂住他的脖子，充满感激。《柯林斯英汉双解大词典》

5·The nuts weren't properly tightened and the wheel came off.

螺母没拧紧，轮子脱落了。《牛津词典》

6·How lovely, cried Wendy so longingly that Mrs. Darling tightened her grip.

“多美好啊。”温迪向往地叫道，达林太太只好把她的手抓得更紧了。

7·They tightened bolts and made connections so ammonia could flow into the module.

他们拧紧螺栓并进行连接，这样氨就可以流入到舱内。

8·He slipped a dog collar around Pinocchio's neck and tightened it so that it would not come off.

他把狗项圈套在皮诺乔的脖子上，把它拉紧，不让它掉下来。

9·His mouth tightened into a thin line.

他的嘴抿成了一道细缝。《牛津词典》

10·Laws on gambling have tightened up recently.

有关赌博的法律最近变得更加严厉。《牛津词典》

(1)tighten up加强；使紧密；拉紧；使更牢固

(1)tighten one's belt节约度日；束紧腰带