close in
US /kloʊz ɪn/
UK /kloʊz ɪn/

1.
bao vây, bao trùm
to surround or enclose something or someone, often in a threatening or restrictive way
:
•
The fog began to close in, making visibility very poor.
Sương mù bắt đầu bao trùm, làm cho tầm nhìn rất kém.
•
The police are closing in on the suspects.
Cảnh sát đang bao vây các nghi phạm.