make a pitch for

Say or do something in support of someone or something, as in That announcer really made a pitch for Sunday's concert, or Her agent's been making a pitch for her books all over town. This expression originally alluded to an inflated sales talk that was “pitched” (in the sense of “thrown”) at the listener. [Slang; late 1800s]

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.