The antonyms for "gives leg up" are plentiful, including phrases like "sets back," "brings down," and "slows down." These antonyms carry a negative connotation and imply that instead of receiving assistance or a boost, someone is hindered or prevented from achieving their goals. Other antonyms could include "ignores," "overlooks," or "neglects," suggesting a lack of support or assistance altogether. Ultimately, the use of antonyms for "gives leg up" depends on the context in which the phrase is used and the writer or speaker's intent. By choosing the correct antonym, one can successfully communicate the opposite meaning and shift the tone of their message.