catch a glimpse of

US /kætʃ ə ˈɡlɪmps ʌv/
UK /kætʃ ə ˈɡlɪmps ʌv/
"catch a glimpse of" picture
1.

瞥見, 一瞥

to see something or someone for a very short time or only partially

:
I managed to catch a glimpse of the celebrity as she entered the building.
我設法瞥見了那位名人進入大樓的身影。
We only caught a glimpse of the rare bird before it flew away.
我們只瞥見了那隻稀有鳥類一眼,它就飛走了。