Antonyms for "catches up to" include "falls behind," "loses ground," "delayed," "lags," "slows down," and "fails to catch up with." These words describe the opposite of catching up to someone or something, which is to either be left behind or to not make progress as quickly. Falling behind can be the result of lacking in a certain area, not putting in enough effort, or simply struggling to keep up with the pace of others. Loss of ground may also indicate a regression or setback in progress that is difficult to overcome without extra effort.