Fast look
Synonyms for the word glance include, but are not limited to: glimpse, eyeball, check out, gander and peek. The word Glance comes from the middle of the 15th century.
Quick scope
If you are talking about when someone likes a person than it is when you think a cute boy or girl is looking at you and you take a quick glance to see if they are looking or not. You take a quick glance at something or someone.
"Just take a quick glance over there."
Other words are glance, peep. peek.
A glance is a quick look. It is also used as a verb. "I glanced up at the window, but she was gone." "I gave a quick glance right and left, and crossed the road."
peep
Glance
attention, beholding, glance, complextion
gaze, watch, gawk
onceover
They are synonyms.