There are several antonyms for the phrase "fall on one's knees," which typically refers to an act of submission, supplication, or reverence. Some of the antonyms for this phrase include stand tall, remain upright, stand firm, resist, and rebel. Standing tall connotes a sense of confidence and strength, whereas falling on one's knees suggests weakness and humility. Similarly, standing firm and resisting imply a refusal to bow down or be subservient to another. Rebellion, on the other hand, implies an outright rejection of authority or domination. In contrast to the physical act of falling on one's knees, these antonyms suggest an attitude of defiance, independence, and self-reliance.