Glance on
Definition 1 of 2
Pro Tip 1/3Brief Action
Used for actions that are done quickly, without spending much time on them. 
She glanced on the clock before rushing out.
Pro Tip 2/3Casual Observation
Implies a casual or non-thorough observation of something. 
During the walk, he glanced on the shop windows.
Pro Tip 3/3Subtle Check
Often done discreetly to check something or someone without being obvious. 
In the meeting, Lisa glanced on her notes.