Longman Dictionary of Contemporary English homepage

decompress

 verb
     
Related topics: Computers, Engineering
de‧com‧press [transitive]
1TE to reduce the pressure of air on something
2TD technical to change the information in a computer document back into a form that can be easily read or used, when the information was stored on the computer in a special form that used less space on the computer's memory:
Most Macintosh computers can decompress files automatically.
—decompression noun [uncountable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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