Yy: Yark or Yerk

v. t.	1.	To throw or thrust with a sudden, smart movement; to kick or strike suddenly; to jerk. Their wounded steeds . . . Yerk out their armed heels at their dead masters. - Shak.
	2.	To strike or lash with a whip.
v. i.	1.	To throw out the heels; to kick; to jerk. They flirt, they yerk, they backward . . . fling. - Drayton.
	2.	To move a quick, jerking motion.
n.	1.	A sudden or quick thrust or motion; a jerk.

Webster's Revised Unabridged Dictionary, published 1913 by C. & G. Merriam Co.