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1. verb To check the status, condition, or wellbeing of someone or something through an inspection or visit. We need to check up on grandma and see how she is coping with all this snow. I just checked up on the baby, and he's still sleeping. Can you check up on the dryer and tell me if it's still running?
2. noun A visit to a doctor for an examination, often as part of routine monitoring (rather than for an acute condition or reason). In this usage, the phrase is often hyphenated. Oh, it's just my yearly check-up, nothing to worry about.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
check up (on someone or something)
to determine the state of someone or something. Please don't check up on me. I can be trusted. I see no need to check up.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
see under check on.
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.