This is the 6448th most frequent Korean word.
얼핏
"At a glance" or "briefly/suddenly in passing."
Here, '얼핏' is used to describe the action of seeing something momentarily or briefly.
나는 얼핏 그녀를 본 것 같아요.
I think I briefly caught sight of her.
In this sentence, '얼핏' implies hearing or understanding something faintly or superficially.
그 이야기를 얼핏 듣기에는 참 슬픈 이야기 같아요.
From what I heard briefly, it seems like a really sad story.
Here, '얼핏' indicates forming an impression of someone or something at a glance, without deep consideration.