The phrase "be one's back" refers to someone's presence or existence. Its antonyms are "be absent," "be gone," or "be missing." These antonyms imply that the person is not physically present or has left a particular place. "Be absent" suggests that the person is not available or cannot be found in a specific location. "Be gone" implies that the person has departed and is no longer there. "Be missing" indicates that the person's whereabouts are unknown or that they are lost. Knowing the antonyms for "be one's back" can help improve communication and understanding in different situations, such as when one is trying to find a missing person.
