All 3 Uses

writhe
in
The Two Towers
(Auto-generated)

He writhed, and tried to get his mouth to his ankle and bite the rope.†
Chpt 4.1 *

writhed = moved in a twisting or contorted motion
The blue-gleaming blade shore through them like a scythe through grass, and they leaped and writhed and then hung loose.†
Chpt 4.9
Heaving up again, wrenching away from the pain, she bent her writhing limbs beneath her and sprang backwards in a convulsive leap.†
Chpt 4.10

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)