The antonyms for the phrase "not snuff" could be varied depending on the context in which it is being used. The word "snuff" generally refers to the act of inhaling powdered tobacco or taking away the life of someone, in which case the antonyms could be "inhale," "breathe in," or "revive," "keep alive," respectively. However, if the phrase is used to imply disapproval, the antonyms could be "approval," "acceptance," or "admiration." Furthermore, if used in the sense of an unsuccessful attempt, the antonyms could be "successful," "accomplished," or "achieved." Therefore, the antonyms for "not snuff" are context-driven and vary based on the interpretation of the phrase.