close up

柯林斯词典

1. PHRASAL VERB If someone closes up a building, they shut it completely and securely, often because they are going away. (指临行前) 锁好
Just close up the shop. 就把店锁好。
The summer house had been closed up all year. 避暑别墅全年都是门户紧闭的。
2. PHRASAL VERB If an opening, gap, or something hollow closes up, or if you close it up, it becomes closed or covered. (缺口、缝隙) 闭合
Don't use cold water as it shocks the blood vessels into closing up. 不要用冷水，因为冷水会刺激血管，使之闭合。