steal a glance/look
steal a glance (at someone or something)
To look at someone or something very quickly and discreetly. That boy just stole a glance at you again! I think he likes you! I stole a glance to see if the teacher was watching us.
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.
steal a ˈglance/ˈlook (at somebody/something)(written) look quickly at somebody/something, so that nobody notices you looking: He stole a glance at her out of the corner of his eye.
Farlex Partner Idioms Dictionary © Farlex 2017