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WordNet (r) 3.0 (2006) (WordNet)

decompress
v 1: restore to its uncompressed form; "decompress data" [synonym:
{decompress}, {uncompress}] [ant: {compact}, {compress},
{pack together}]
2: decrease the pressure of; "depressurize the cabin in the air
plane" [synonym: {depressurize}, {depressurise}, {decompress}]
[ant: {pressurise}, {pressurize}]
3: 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" [synonym:
{relax}, {loosen up}, {unbend}, {unwind}, {decompress}, {slow
down}] [ant: {tense}, {tense up}]