#1 decompress v. [uncompress] restore to its uncompressed form; "decompress data". wn
#2 decompress v. [depressurize, depressurise] decrease the pressure of; "depressurize the cabin in the air plane". wn
#3 decompress v. [relax, loosen up, unbend, unwind, slow down] become less tense, rest, or take one's ease; "He relaxed in the hot tub"; "Let's all relax after a hard day's work". wn
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