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British Dictionary definitions for close-in
verb (intr, adverb)
Idioms and Phrases with close-in
Surround, enclose, envelop, as in The fog closed in and we couldn't see two yards in front of us, or She felt the room was closing in. [c. 1400]
Also, close in on or upon. Draw in, approach, as in The police closed in on the suspect. [Early 1800s]