a comprehensive physical examination: He went to the doctor for a checkup.
an examination or close scrutiny, as for verification, accuracy, or comparison: They gave the motor a checkup.

1885–90, Americanism; noun use of verb phrase check up Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
checkup (ˈtʃɛkˌʌp)
1.  an examination to see if something is in order
2.  med a medical examination, esp one taken at regular intervals to verify a normal state of health or discover a disease in its early stages
vb (sometimes foll by on)
3.  to investigate or make an inquiry into (a person's character, evidence, etc), esp when suspicions have been aroused

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"careful examination," 1921, Amer.Eng., from check + up, on notion of a checklist of things to be examined. The verbal phrase check up (on) is attested from 1889.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

checkup check·up (chěk'ŭp')

  1. An examination or inspection.

  2. A general physical examination.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences for checkups
Regular dental checkups and professional teeth cleaning as required.
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