The phrase "hikes up" usually means to raise or lift something, such as a skirt or pants. The antonyms for this phrase would be words that indicate the opposite action, such as lowering, dropping, or lowering down. In certain contexts, antonyms might also include words that signify not doing the action at all, like leaving the hemline or waistline untouched. Alternatively, other antonyms for "hikes up" could reflect a sense of restraint, such as keeping one's clothes carefully close or using a snug fit. Overall, the antonyms for "hikes up" would depend on the specific meaning intended and the context in which the phrase is used.