Uncompact is a word that means to loosen or separate something compacted or compressed. Synonyms for uncompact include uncompress, expand, dilate, relax, ease, stretch, unravel, disentangle, unwind, and unfurl. These synonyms suggest an opening up or unfolding of something that was previously restricted or compressed. For example, uncompress is often used in the context of data files that have been compressed for storage purposes, and must be uncompressed in order to access their contents. Similarly, stretching or expanding a muscle or material removes tightness or compression, allowing it to function more freely and efficiently.