catch a glimpse of
US /kætʃ ə ˈɡlɪmps ʌv/
UK /kætʃ ə ˈɡlɪmps ʌv/

1.
echar un vistazo a, vislumbrar
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.
Logré echar un vistazo a la celebridad mientras entraba al edificio.
•
We only caught a glimpse of the rare bird before it flew away.
Solo vimos un atisbo del ave rara antes de que se fuera volando.