turn (one's) stomach
To cause one to become nauseated. Ugh, the smell of eggs cooking just turns my stomach. The amount of money we spent at that restaurant turned my stomach.
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.