Leer (verb/noun)
lee-r
Look or gaze in a lascivious or unpleasant way.
Mid 16th century (in the general sense ‘look sideways or askance’): perhaps from obsolete leer ‘cheek’, from Old English hlēor, as though the sense were ‘to glance over one’s cheek’.
Example sentences
“They were leering at her as she walked through the high street.”