Antonyms for the phrase "watch one's step" include disregard, neglect, overlook, and ignore. These antonyms imply that one is not paying attention or being careless with their actions, which can lead to dangerous situations. Disregard means to pay no attention to something, neglect means to ignore or not give proper attention to something, overlook means to fail to notice or consider something, and ignore means to refuse to acknowledge or pay attention to something. These antonyms serve as a reminder to be vigilant and conscious of one's surroundings for the sake of personal safety.