turn one's stomach
Nauseate one, disgust one, as in That mess of spoiled food turns my stomach. This idiom alludes to being so nauseated that one vomits—that is, the stomach in effect turns around and brings up food. It was first recorded in 1622.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.