From Longman Dictionary of Contemporary Englishspot checkˌspot ˈcheck noun [countable]CHECK/MAKE SUREan examination of a few things or people from a group, to check whether everything is correct or satisfactoryspot check onspot checks on qualitymake/do/carry out etc spot checksWe carry out spot checks on the vehicles before they leave the depot. —spot check verb [transitive]We spot check everyone’s work.
Examples from the Corpus
spot check• Customsofficers make randomspot checks.• Most driverspass the spot check, not so this Volkswagen.From Longman Business Dictionaryspot checkˈspot check [countable]a check on particular things or people from a group, done without warningA spot check of 140 vehicles entering the car park revealed 18 people not wearing a seatbelt. →check