| 词组 | tighten |
| 释义 | tighten [tightened, tightened, tightening] tighten up 1. tighten up sth • tighten sth up • tighten up to make a rule, law, or system more strict: ▪ French authorities say they plan to tighten up the immigration laws. + on ▪ Airlines are tightening up on security after warnings of terrorist attacks. 2. tighten up • tighten up sth • tighten sth up if your muscles tighten up, or you tighten up your muscles, they become stiff, especially because you have done a lot of exercise, or because you are nervous: ▪ These exercises will help to tighten up your stomach muscles. ▪ The muscles in my leg suddenly tightened up and I had to stop swimming. 3. tighten up sth • tighten sth up to turn something, such as a screw, so that another thing is firmly held in place: ▪ Tighten up the screws to keep the axle from slipping forward. ■ OPPOSITE: loosen 4. tighten up • tighten up sth • tighten sth up if a team, organization, group etc tightens up, they work together in a more effective way and make fewer mistakes: ▪ Milan have tightened up their defence and they will be a hard team to beat. |
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