ちらっと
ちらっと · chiratto · JLPT N1 · adverb
at a glance
👀 ちら (flicker, flutter) + っと (quick, sudden) = a fleeting glance
The root ちら also appears in ちらつく (to flicker or flutter), so the eyes flick over something briefly. The same word covers an accidental glimpse, as in ちらっと見えた (caught a glimpse of it).