Carry on is a versatile phrase, used in several different contexts to denote different things. The English language offers a range of synonyms for this phrase, including continue, persevere, persist, maintain, sustain, and bear on. In some cases, carry on can also be replaced with the phrase "go ahead" or "proceed." It is important to note that the exact synonym used will depend upon the context of the sentence, as different synonyms might be more appropriate in different situations. For instance, "persevere" would be more applicable when describing someone's efforts to overcome a difficult challenge, while "continue" would be more appropriate when referring to a task or activity that someone has resumed after a break.