His stomach contracted again with revulsion-or was it a premonition?

My stomach contracted so hard I had to swallow vomit.

He felt another pitching in his belly as his stomach contracted for a second time.

But the fourth stomach was contracting well and there were plenty of rumenal sounds.

My stomach contracted and my heart went into a somersault.

My stomach contracted as if something were pulling me down from the middle part of my body.

For an instant he stared, frozen; his stomach contracted into a painful ball.

Collier's stomach contracted and the sweat of renewed fear broke out on his body.

Jack's stomach contracted, and his testicles froze up under his body.

His stomach contracted and dull pain in his empty lungs spread.