The antonyms for "fit out" are as follows: undress, strip, disrobe, undecorate, deaccessorize, unadorn, and unfurnish. These terms signify the opposite of "fit out" in the sense that they involve removing items or decorations, rather than adding them. For example, when someone is "fitting out" a room, they are filling it with furniture, decor, and other accessories. Conversely, when someone is "stripping" or "undressing" a room, they are removing items and leaving it bare. Therefore, the antonyms for "fit out" can be used to describe the act of taking something away, rather than adding to it.