lock down
片語動詞所屬單字lock
lock down — 片語動詞
1. To close a building or area so that no one can enter or leave.
1.片語動詞
釋義
封鎖
To close a building or area so that no one can enter or leave.
例句
The school was locked down after a security threat.
Officers locked down the entire neighborhood for investigation.