| 词汇 | tighten up |
| 释义 | tighten up [phrasal verb] tighten up or tighten (something) up or tighten up (something) : to become more strict or effective or to make (something) more strict or effective（使）变得更严格，变得更有效 Security around the building has tightened up recently.最近，大楼周围的安全措施加强了。 They tightened up security around the building.他们加强了大楼周围的安全措施。 We installed new machines to tighten up the assembly line.我们安装了新机器以提高装配线的工效。 tighten |
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