jerk

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jerk

 [jerk]
a sudden reflex or involuntary movement.
Achilles jerk (ankle jerk) plantar extension of the foot elicited by a tap on the achilles tendon, while the patient is seated on a bed or chair, with feet hanging freely; called also Achilles reflex and triceps surae jerk or reflex.
biceps jerk biceps reflex.
elbow jerk involuntary flexion of the elbow on striking the tendon of the biceps or triceps muscle.
jaw jerk jaw-jerk reflex.
knee jerk see knee jerk.
tendon jerk tendon reflex.
triceps surae jerk ankle jerk.

jerk

(jerk),
1. A sudden pull.
2. Synonym(s): deep reflex

jerk

(jĕrk)
1. A sudden pull.
2. Synonym(s): deep reflex.

jerk

1. A sudden involuntary movement, usually of the head or a limb.
2. A reflex muscle or muscle group contraction in response to a sudden stretching by briskly tapping the tendon. A tendon reflex.

jerk

(jĕrk)
A sudden pull.
References in periodicals archive ?
Kuduro is trancelike and choreographed, traditional and improvised, rhythmic and jerkily uncoordinated.
(Okay, jerkily steady--but it's not bulling up or bearing down.) The jump on the far left began on the first day of the New Year, the day after President Obama signed the new sanctions into law.
Native Americans strung a fox skin on a cord between two trees and drew it jerkily back and forth to attract waterfowl.
Memories, of course, will fade, apart from the memories of those who lost loved ones or those who have spent these recent days in fear and anger; but until the next incident, what chance is there of action that is something other than ad hoc and jerkily reactive?
A naughty part of me thought, "And I would bet money you drive it just like this." He had driven Francis's car kind of jerkily, too, the night we'd met, and Francis's car had an automatic transmission.
particularly nasty black hole, jerkily pacing back and forth, moaning a
The lever moves a little jerkily on the automatic side but its simple nudging forward or backwards in manual mode is much more direct.
"Pack up your troubles in your old kit bag and smile, smile, smile...." "When you're smiling, when you're smiling, the whole world smiles with you...." (When I was angry at her house, I learned to hide under the bathroom sink.) My grandfather was her knight; he called her, fondly, "Madame Queen." After he was diagnosed with Parkinson's, he moved more and more slowly and jerkily, until he was like a figure in a crude animation; he would lie like an effigy for days on their bed.
Wendy's corpse is first spotted near a river, jerkily rising and falling as if pushed from within, her marionette-like spasms brilliantly choreographed and executed in a postmortem revival witnessed only by a spooked German shepherd.
*** The car was riding jerkily in low gear over the rough track which was our farm road.
This time housemates were more aware of what they were in for, plus we could watch them walk into the house live, albeit slowly and jerkily, thanks to new invention the internet.
In town, the diddy two-seater still struggles in auto, switching cogs laboriously and sometimes jerkily, but somehow this passes you by when you''re in nose-to-tail crush hour.