tighten/ 'taɪtn /

1.vt.[+rope] [ strap] 
拉紧

2.vt.[+screw] [ bolt] 
弄紧

3.vt.[+grip] [ security] [ rules etc] 
加紧

4.vi.[grip+] 
握紧

5.vi.[rope] [ strap etc+] 
拉紧