fleeting glance. Fig. a quick glance; a very brief look. I had a fleeting glance at the car as it sped by, but I couldn't read the license place number.

What does fleeting by mean?

: passing swiftly : transitory … the often fleeting nature of fame and fortune …—

What do you call a fleeting moment?

Some common synonyms of fleeting are ephemeral, evanescent, fugitive, momentary, transient, and transitory. While all these words mean "lasting or staying only a short time," fugitive and fleeting imply passing so quickly as to make apprehending difficult.