sidelong
adjective /ˈsaɪdlɒŋ/
/ˈsaɪdlɔːŋ/
[only before noun]- (of a look) out of the corner of your eye, especially in a way that is secret or shows that you do not approve of somebody/something
- She cast a sidelong glance at Eric to see if he had noticed her blunder.
Oxford Collocations DictionarySidelong is used with these nouns:- glance
Word Originlate Middle English: alteration of earlier sideling, from side + the adverbial suffix -ling.