unalias
NAME
unalias - Remove each name from the list of defined aliasesSYNOPSIS
unalias [-a] [name ...]
DESCRIPTION
Remove each name from the list of defined aliases. If -a is supplied, all alias definitions are removed. The return value is true unless a supplied name is not a defined alias.
SEE ALSO
This is extracted from the main bash man page, see there for more details.