Webster's Revised Unabridged Dictionary · 1913

Yerk

Yerk , transitive verb

[See Yerk.]

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. — Shakespeare
2.
To strike or lash with a whip. [Obsolete or Scottish]

Yerk , intransitive verb

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.

Yerk , noun

A sudden or quick thrust or motion; a jerk.