動(dòng)詞 tighten:

1. make tight or tighter
   同義詞：fasten
2. become tight or tighter
3. restrict
   同義詞：stiffen, tighten up, constrain
4. narrow or limit
   同義詞：reduce

1. He tightened his grip on her arm.
   他緊抓她的手臂。
2. Controls in the city have gradually tightened.
   對(duì)這個(gè)城市的控制逐漸加強(qiáng)。
3. This screw needs tightening.
   這螺絲釘需要再擰緊些。