verb (used with object)

  1. to cause to undergo decompression.

verb (used without object)

  1. to undergo decompression.
  2. Informal. to relax; unwind.


  1. to relieve (a substance) of pressure or (of a substance) to be relieved of pressure
  2. to return (a diver, caisson worker, etc) to a condition of normal atmospheric pressure gradually from a condition of increased pressure or (of a diver, etc) to be returned to such a condition

1905, from de- + compress. Related: Decompressed; decompressing.

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