glance
It can be, meaning a quick glance. But it is also a verb meaning to peep or glance furtively.
She took a quick glance at the clock before diving back into her work.
give a glance at, give a peek,
Backward glance
at a glance
backward glance
"1 glance 2 3 glance" is a play on words that sounds like "once, twice, three times." It's a clever way to say something happened multiple times, like taking a quick look or glance. So, in a nutshell, it's basically saying you looked three times in a snazzy way.
missed the second glance
backwards glance
glance glance
Glance IS correct.