Antonyms for the phrase "catching on to" include "missing out on," "ignoring," "misunderstanding," "confused," "unaware," and "unsure." While "catching on to" implies understanding and awareness, the antonyms suggest a lack of comprehension, information, or interest. For instance, if someone is not paying attention or is struggling to grasp an idea, they might be described by one of these antonyms. Additionally, if someone intentionally chooses to ignore something or someone, they are also not "catching on to" what is happening. In contrast, being curious, attentive, and receptive to new ideas and knowledge is essential to "catching on to" an emerging trend, concept, or perspective.