spot check

noun
a random sampling or quick sample investigation: A spot check showed that at least ten percent of the items were defective.

Origin:
1940–45

Dictionary.com Unabridged

spot-check

[spot-chek]
verb (used with object)
1.
to examine or investigate by means of a spot check.
verb (used without object)
2.
to conduct a spot check.

Origin:
1940–45

spot-checker, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To spot check
Collins
World English Dictionary
spot check
 
n
1.  a quick random examination
2.  a check made without prior warning
 
vb
3.  (tr) to perform a spot check on

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
My foreman advises me on unusual problems and my work is subject to spot check during progress.
Commissary officials maintain the right to spot check for unauthorized people in their stores.
Conducts regular and/or spot check inventories of merchandise, supplies, or equipment.
Use hand-held level or eye level to check level of tank and spot check level of leach line.
Synonyms
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