Antonyms for the phrase "falls on knees" could include "stands tall," "remains upright," "maintains composure," or "avoids collapsing." Instead of falling on their knees, someone might "stay steady," "resist the urge to kneel," or "hold their ground." These antonyms suggest a sense of strength and resilience, as opposed to the vulnerability and surrender implied by falling on one's knees. Additionally, some antonyms could be more figurative in nature, such as "rebels against authority," "disobeys orders," or "defiantly ignores commands." These alternatives present a sense of rebellion and defiance, in contrast to the submissive act of falling on one's knees.