Etymology
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decompress (v.)

"relieve or reduce pressure," by 1866, from de- + compress (v.). In early use especially "restore gradually to normal conditions  of air pressure." Figurative sense "become calm, relax" is by 1964. Related: Decompressed; decompressing.

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Definitions of decompress

decompress (v.)
restore to its uncompressed form;
decompress data
Synonyms: uncompress
decompress (v.)
decrease the pressure of;
Synonyms: depressurize / depressurise
decompress (v.)
become less tense, rest, or take one's ease;
Synonyms: relax / loosen up / unbend / unwind / slow down
From wordnet.princeton.edu