noun
a person or thing that checks, such as a person who verifies something or a pattern of squares used in a game like checkers
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The plagiarism checker identified several instances of copied content in the student's paper.
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I always use a grammar checker before submitting my essays.
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The spell checker on my phone is so helpful when I'm texting quickly.
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She acted as a moral checker, always making sure her friends were making good choices.