adverb to, toward or at one side.
— synonyms: sideways, obliquely
adjective (used especially of glances) directed to one side with or as if with doubt or suspicion or envy.
— synonyms: askance, askant, asquint, squint, squint-eyed, squinty
adjective situated at or extending to the side.
— synonyms: lateral
adjective inclining or directed to one side.
Examples
“He cast me a sidelong glance.”
“She made some sidelong remarks about his manhood.”