Yerk

1. n. A sudden or quick thrust or motion; a jerk.
2. v. t. To throw or thrust with a sudden, smart movement; to kick or strike suddenly; to jerk.
3. v. t. To strike or lash with a whip.
4. v. i. To throw out the heels; to kick; to jerk.
5. v. i. To move a quick, jerking motion.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.