The term "got out from under" generally means to escape a difficult or burdensome situation. Antonyms for this phrase would include "surrendered" or "succumbed," meaning to give up or fall prey to the situation. Another antonym would be "stayed put," meaning to remain in the difficult situation instead of attempting to escape it. Alternatively, "embraced" or "accepted" would be antonyms that imply a willingness to face challenges and not run away from them. In summary, antonyms for "got out from under" represent the idea of giving up, staying put, or embracing challenges rather than trying to escape them.