look in on

look in on idiom
Pay a brief visit, as in I'm just going to look in on Gail and the new baby; I won't stay long. [c. 1600] Also see look someone in the face.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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