Rar is a derived term of unrar.
As a verb unrar
is to decompress (a compressed archive in the RAR format).
As an initialism RAR is
Roshal Archive, a proprietary data compression format.
unrar
English
Verb
(computing) To decompress (a compressed archive in the RAR format). rar
English
Initialism
(Initialism)
(head)
(computing) (Roshal Archive), a proprietary data compression format.
Derived terms
* unrar