Start is a verb that means to begin or commence something. Antonyms for this word refer to the opposite, such as end, finish, or conclude. Other antonyms could include halt, stop, terminate, or cease. These words indicate a break or completion of an activity, rather than the beginning. Another group of antonyms for start could include procrastinate, delay, or hesitate. These words indicate a lack of action, whereas start suggests an active beginning. Overall, antonyms for start are a useful tool for understanding the opposite or different meanings of this word and can help expand vocabulary and communication skills.