make a case for

make a case for something

to explain why something should be done Everything seems to be going pretty well, and she has yet to make a case for change.
Usage notes: also used in the form make a case that (to explain that something is true): It is easy to make a case that he's one of the best baseball players around.
Etymology: based on the legal meaning of make a case (to show that what you say is true)
See also: case, make

make (out) a case for something/doing something

to give good reasons why something should be done You've certainly made out a case for us buying a dishwasher.
See I rest my case
See also: case, make