Jerk

usgb/dʒɜːrk/Volume
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LampPro Tip 1/2
Physical ActionPlay
Describes an abrupt involuntary movement, often in reaction to something unexpected. SlideAfter the prank, everyone watched his body jerk in shock.
LampPro Tip 2/2
Unintentional MotionPlay
Used when someone does a sharp movement they didn't mean to do. SlideHe jerked forward when the bus suddenly stopped.