"Bare off" is a phrase which signifies getting rid of or removing something. Therefore, the antonyms of "bare off" would be keeping or holding onto whatever it is that is being referred to. For instance, if one was talking about a tree, the antonym for "bare off" would be to keep its leaves instead of stripping them. Similarly, if the discussion was about a wall, the antonym of "bare off" would be to paint or decorate it instead of leaving it plain. Therefore, the antonyms for "bare off" mainly involve preserving and maintaining whatever is being referred to - be it a natural entity or a man-made object.