The phrase "slipped on" typically means to lose your footing or balance and fall down. Some antonyms for this phrase might include words or phrases like "stood up," "maintained balance," "remained steady," or "kept your footing." These words suggest a sense of stability or control, rather than the sudden loss of control implied by the phrase "slipped on." Antonyms for "slipped on" might also include more active verbs, such as "leapt," "bounded," or "scrambled," which imply a sense of agility or athleticism rather than a loss of control.