The phrase "gat out from under" typically means to escape from a difficult or challenging situation. Antonyms for this phrase could include words like "succumb," "yield," "surrender," or "submit." These words imply giving up or being defeated rather than triumphing over adversity. Another antonym could be "face the music," which suggests bravely confronting the consequences of one's actions. Similarly, "confront," "face," or "tackle" could also be antonyms, as they imply dealing with a situation head-on rather than avoiding it. In short, the antonyms for "gat out from under" are words that connote defeat or avoidance, rather than success and resilience.