A desire for food or drink
To put up with
True, but her answer left Carmen's stomach tied in a knot.
Her stomach contracted and then twisted into a knot.
As usual, her stomach was grumbling for food.
Her stomach grumbled loudly again.
The truth settled into the pit of her stomach, along with the realization that she meant what she'd said—she would do whatever it took to free the man she loved.