From Longman Dictionary of Contemporary Englishsteal a look/glance etcsteal a look/glance etcLOOK ATto look at someone or something quickly and secretly → steal
Examples from the Corpus
steal a look/glance etc• He stole a glance at her.• Jenna stole a look at him and he was watching her intently, in every way intent.• She stole a glance at him; his features matched the ice in his tone and his eyes surpassed it.• She stole a glance from her future and turned her head. 