"Catch a glimpse" is a commonly used phrase that refers to briefly seeing or noticing something. However, there are many other ways to express the same idea. Some synonyms for "catch a glimpse" include "spot", "view", "witness", "observe", "perceive", "discern", "detect", "espy", and "glimpse". Each of these words conveys the notion of seeing something briefly, but with slightly different nuances. For example, "witness" suggests a more significant or memorable sighting, while "spot" denotes a quick, casual sighting. By varying your word choice, you can add variety and depth to your writing, making it more interesting and engaging for your audience.