noun
a contemptuous or mocking smile, grin, or expression
verb
to smile or grin in a contemptuous or mocking manner
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The teacher gave a stern fleer to the student who was talking during the exam.
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I could see the fleer on his face when he realized he had forgotten his wallet at home.
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She shot him a playful fleer before running off to play with her friends.
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The dark clouds overhead seemed to fleer at the picnic-goers, threatening rain at any moment.