Definition of sidelong adjective from the Oxford Advanced American Dictionary

 

sidelong

 adjective
adjective
NAmE//ˈsaɪdlɔŋ//
 
[only before noun]
 
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(of a look) out of the corner of your eye, especially in a way that is secret or disapproving She cast a sidelong glance at Eric to see if he had noticed her blunder.
sidelongadverb
 
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She looked sidelong at him.