All 5 Uses

writhe
in
Divergent, by Veronica Roth
(Edited)

I walk to the center of the arena and my guts writhe as Peter comes toward me, taller than I remembered, arm muscles standing at attention.
p. 108.9 *

writhe = move in a twisting or contorted motion
Once I'm dressed and the urge to cry is gone, I feel something hot and violent writhing in my stomach.
p. 170.2

writhing = moving in a twisting or contorted motion
Someone else screams too, and someone yells for help, and Edward is still on the floor, writhing and wailing.
p. 202.7
My stomach writhes, partly because I know he makes a good point but I don't want to admit it, and partly because I want something I don't know how to express; I want to press against the space between us until it disappears.
p. 287.1

writhes = moves in a twisting or contorted motion
I can't seem tense, even though I feel like my insides are writhing within me.
p. 359.5

writhing = moving in a twisting or contorted motion

Definitions:

(1) (writhe)
to move in a twisting or contorted motion -- often of a person when struggling or in pain
(2) (meaning too rare to warrant focus)