noun
a discrepancy or lack of compatibility between two or more things
verb
to match or pair incorrectly or inappropriately
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There seems to be a mismatch between the data in the report and the actual numbers.
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I think there's a mismatch between what he said and what actually happened.
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The outfit she's wearing is a total mismatch with those shoes.
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Their personalities are like a mismatched puzzle pieces, never quite fitting together.