A movement that twists or pulls violently; a tug.
"The sudden wrench of his arm pulled the rope taut just before he lost his grip."
make a sudden twisting motion
"The driver jerked the steering wheel to avoid the deer, causing his neck to snap in a sharp wrenching motion."
To violently move in a turn or writhe.
"The baby suddenly wrenched his tiny body away from the cold floor and began to cry."