decompress

verb (used with object)

1. to cause to undergo decompression.

verb (used without object)

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

verb

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

v.

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