Verbs

(v)decompress, uncompressrestore to its uncompressed form“decompress data”
(v)depressurize, depressurise, decompressdecrease the pressure of“depressurize the cabin in the air plane”
(v)relax, loosen up, unbend, unwind, decompress, slow downbecome less tense, rest, or take one's ease“He relaxed in the hot tub”, “Let's all relax after a hard day's work”