Unwrap comes from un- ('reversal') plus wrap, of uncertain origin, attested in Middle English wrappen, perhaps related to Danish dialect vravle ('to wind'). The historical chain includes Old English un- and Middle English wrappen. The quoted older senses, "reversal" and "to wind", supply the semantic anchors for unwrap. The formation is best read as borrowed: the word unwrap carries its older form-history into a compact English lexical shape. In present English it is used as a verb, "to remove the wrapping from something". English derivatives include unwrapped and unwrapping; related English forms include wrap and wrapper. The result is a verb whose etymology preserves both the older form and the later English specialization.