check in

check in idiom
  1. Record one's arrival at a hotel, conference, or other function, as in I asked the hotel if we could check in early. [Early 1900s] Also see check into, def. 2.
  2. Die, as in With the plane rapidly losing fuel, the pilot was sure he'd check in. [Slang; early 1900s] Also see check out.

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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