The phrase "tan one hide" typically refers to the process of preserving animal skin by tanning it. Antonyms for this phrase would be words that describe the opposite of tanning or preserving skin. Some possible antonyms include discoloring, decaying, rotting, spoiling, or decomposing. These words suggest a loss of quality, rather than preservation or improvement. In a broader sense, antonyms for "tan one hide" could also include words like neglect, ignore, mistreat, or abuse, which suggest a lack of care or attention to the preservation of something valuable. Antonyms can help us understand the full range of meaning and implications of a word or phrase.