The phrase "gotten in with" typically means to become friends or acquaintances with someone, often for personal gain. Its opposite antonym would be to "leave out of" or "exclude from" a group or social circle. Other antonyms for "gotten in with" could include "separated from", "kept apart from", or "isolated from". These antonyms suggest a sense of distance or separation, rather than the close connections implied by "gotten in with". Alternatively, synonyms for "gotten in with" might include "befriended", "joined up with", or "connected with", all of which emphasize a sense of collaboration or cooperation between people or groups.