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See more synonyms for close-in on Thesaurus.com
  1. near, as to a common center; adjacent, especially to a city: The city is enveloping its close-in suburbs.
  2. occurring or provided at close quarters: Fighter planes provided daring close-in air support.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for close in

close in

verb (intr, adverb)
  1. (of days) to become shorter with the approach of winter
  2. (foll by on or upon) to advance (on) so as to encircle or surround
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Idioms and Phrases with close in

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]

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Also, close in on or upon. Draw in, approach, as in The police closed in on the suspect. [Early 1800s]

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.