feed the kitty
Contribute money to a pool or reserve, as in I can't make a big donation this year, but I'm willing to feed the kitty something. This term, originating in gambling, incorporates a pun, since kitty can mean “cat” as well as “pool.” [Late 1800s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.