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.
(..) Dialogue: Marked=..,Default,NTP,!Effect,...asphodel and wormwood make a sleeping potion so powerful\Nit is known as the Draught of the Living Dead. Dialogue: Marked=..,Default,NTP,!Effect,A bezoar is a stone taken from the stomach of a goat\Nand it will save you from most poisons (..)2001 Harry Potter and the Sorcerer's Stone