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Noun: spot check  spót chek
  1. A check on work performance or product quality made at random times without warning
    "spot checks ensure a high level of performance by employees"
Verb: spot-check
  1. Pick out random samples for examination in order to ensure high quality

Derived forms: spot-checks, spot checks, spot-checked, spot-checking

Type of: ascertain, assure, check, checkout, check-out procedure, control, ensure, insure, see, see to it