The phrase "chomps the bit" refers to a horse's behavior of biting or grinding its teeth on the bit while being ridden. Antonyms for this phrase might include synonyms for calm or contentment, such as "relaxed," "unhurried," or "untroubled." Other possible antonyms might be words that suggest a lack of enthusiasm, such as "apathetic," "indifferent," or "uninterested." Alternatively, antonyms for "chomps the bit" might include phrases that suggest caution or restraint, such as "holds back," "pools resources," or "exercises patience." Ultimately, the choice of antonyms will depend on the context in which "chomps the bit" is being used, and the tone or mood that the writer or speaker is trying to convey.