jerk

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jerk

[jərk]
(mechanics)
The rate of change of acceleration; it is the third derivative of position with respect to time.
A unit of rate of change of acceleration, equal to 1 foot (30.48 centimeters) per second squared per second.
References in periodicals archive ?
In other words, every time the bolt is closed, the hammer, instead of holding in the cocked position, jerks off the sear and makes a shot impossible.
Thus when the girl next door is unjustly pilloried as a slut--or "worn shoes" (as the somewhat surreal subtitles say)--and raped by the very Red Guard leader who accuses her of immorality, 7-year-old Xiang Yang's reaction is to sniff the stool she stood on and steal her shoes, which he later masturbates with (Xiang not only jerks off to a variety of stimuli, he masturbates with posters, slippers, books).