Catch sight is a commonly used phrase that means to see something or someone unexpectedly or briefly. It is a phrase that can be substituted with various synonyms to emphasize a different aspect of the experience. Some synonyms for catch sight include spot, glimpse, observe, notice, perceive, view, witness, behold, and spy. Each of these words implies a slightly different context and emotional connotation. For instance, spot emphasizes suddenness, glimpse emphasizes brevity, witness emphasizes importance, and behold emphasizes wonder. Whatever word you choose, it is clear that catching sight is a fascinating phenomenon that can evoke a wide range of emotions and reactions in people.