The phrase "called time" refers to bringing something to an end or stopping it. The opposite of calling time could be to prolong, continue or extend something. Antonyms for this phrase could include "keep going", "prolong", "continue", "resume", "restart", "renew", "rekindle", "revive" or "stay open". These words convey a sense of carrying on or restarting an activity or situation, rather than ending it. In certain contexts, for example a football game, "called time" could also mean to stop the clock, therefore the antonym would be to "start" or "run the clock". Overall, the antonyms for "called time" are words that imply continuation or renewal, rather than termination.