(noun) a facial expression of contempt or scorn; the upper lip curls. Synonyms: sneer.
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Noun Definition 1
(noun) a suggestive or sneering look or grin.
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Noun Definition 2
(verb) look suggestively or obliquely; look or gaze with a sly, immodest, or malign expression. Example: "The men leered at the young women on the beach."