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 ?
"But if you went out into the slipstream, your head could get jerked off."
Unless he anticipates, he will always have a late take-off or get jerked off the ground.