Her stomach flipped at the sight of him.

Kaye felt her stomach flip again, but it was not a bad sensation.

Lan's stomach flipped, but it was the only part of him that could move.

My stomach flipped and tried to stretch itself around my spine.

Her stomach flipped and she heard her heart pounding over the din.

His stomach flipped with fear and his hands wouldn't stop shaking.

Lehmann felt his stomach flip over for the second time that morning.

My stomach flipped a little and then settled again.

My stomach flipped, and all at once, I was sure she didn't feel the same way.

Now her heart was hammering, and her stomach flipped with fear.