noun
a type of facial expression characterized by a slight, often scornful smile
verb
to smile in a smug, scornful, or self-satisfied way
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The detective's smir showed that he knew more than he was letting on.
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She couldn't help but smir when she saw her ex's new girlfriend.
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He gave a little smir before confidently walking away.
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The sun seemed to smir behind the clouds, promising a beautiful day ahead.