Synonyms of 'leer'
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If you smirk, you smile in an unpleasant way, often because you believe that you have gained an advantage over someone else or know something that they do not know.
They nudged each other and smirked.
Thesaurus for leer from the Collins English Thesaurus
If someone leers at you, they smile in an unpleasant way, usually because they are sexually interested in you.