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Entry 2 senses · 2 variants Webster, 1913

Knee jerk

· IPA
01 A jerk or forward kick of the lower part of the leg produced by a blow or sudden strain upon the patellar tendon of the knee, which causes …
  1. 1.
    A jerk or forward kick of the lower part of the leg produced by a blow or sudden strain upon the patellar tendon of the knee, which causes a sudden contraction of the quadriceps muscle; the patellar reflex.(Physiol.)
02 n. emotional and predictable; -- of certain people and their reactions to events.
  1. 1.
    emotional and predictable; -- of certain people and their reactions to events.