Take this medication 'on an empty stomach'. [=when your stomach is empty because you have not eaten for a time]
When I had the flu, just the thought of eating made me 'sick to my stomach'. [='nauseous']
She felt a flutter in 'the pit of her stomach' when he walked through the door.
(..) The city will fall within a day. If we turn the dragons loose, tens of thousands will die in the firestorms. It's called war. You don't have the stomach for it, scurry back into hiding. I know how you wage war. We don't poison little girls here. (..)2017 TvShow: Game of Thrones Title: Stormborn Season: 7 Episode 2