adverb taking the 'to' particle, adverb
fleeting glimpse; brief glance; momentary sight
Describes catching a very brief, partial look at something, often accidentally or in passing. Similar to ちらっと but slightly more literary or emphatic.
See also: ちらっと
I caught a fleeting glimpse of the next room through a gap in the curtain.
She glanced briefly at her watch.
A red ribbon was briefly visible peeking out from under the skirt.
He glanced quickly at his watch and got up from his seat.
The inside could be glimpsed briefly through a gap in the curtain.