From The Free On-line Dictionary of Computing (19 January 2023):
deflate
deflate compression
deflate/inflate compression
inflate
<file format, compression> A compression standard derived
from LZ77; it is reportedly used in zip, gzip, PKZIP,
and png, among others.
Unlike LZW, deflate compression does not use patented
compression algorithms.
Used as a verb to mean to compress (not decompress!) a file
which has been compressed using deflate compression. The
opposite, inflate, means to decompress data which has been
deflated.
Deflate is described in RFC 1951.
(1997-06-21)