Shave off is a phrasal verb that denotes the act of removing hair from the body surface by cutting it down with a sharp tool or razor. As such, its antonyms are words that signify leaving hair intact. Some of these words include hair growth, cultivate hair, grow out hair, and let hair grow. Additionally, words such as retain, preserve, and conserve, are antonyms of shave off, particularly when referring to hair, fur, or any other body covering. The opposite of shave off can also be expressed using the phrasal verbs 'grow' and 'keep.' Overall, the antonyms of the word shave off serve to indicate actions that bring about the retention or growth of hair.