spot check

n.
An inspection or investigation that is carried out at random or limited to a few instances.

spot-check spot'-check' (spŏt'chĕk') v.

Supervisory check on work performance or product quality done at random intervals. Spot checks are unannounced and can occur at any time. The purpose is to ensure a continually high performance level on the part of employees.

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The verb has one meaning:

Meaning #1: pick out random samples for examination; make spot checks

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