/ˈkɔ:dn ||; ˈkɔrdṇ/noun [C] a line or ring of police or soldiers that prevents people from entering an area （由警察或士兵组成的）警戒线，封锁线，警戒圈
cordon²
/ˈkɔ:dn ||; ˈkɔrdṇ/verbcordon sth off to stop people entering an area by surrounding it with a ring of police or soldiers 以警戒线封锁（某地方）: The street where the bomb was discovered was quickly cordoned off.发现炸弹的街道很快便被封锁起来。