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"check" is also used as a crossword clue. If that's what you saw, the answer is often test (4 letters).
Definitions
To inspect, verify, stop, or mark; also a bill or pattern.
Word origin
From Middle English chekken, partly from Old French eschequier and partly from the noun (see above).
Used in a sentence
“I don't know if she will be there, but it's worth a check.”
“checks and balances”
“The castle moat should hold the enemy in check.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Look over carefully”5 letters
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