knee-jerk definition

  • adjective:
    • Slang Definitely predictable; automated: "quick, easy laughs and knee-jerk answers” ( Ny).
    • Slang responding in an instant when you look at the expected way: a knee-jerk cynic.
    • Automatic, spontaneous, effortlessly predictable
  • noun:
    • a rapid reflexive action associated with the leg underneath the knee, as a reaction to a tap towards the tendon just below the patella (kneecap).
    • an abrupt jerking for the leg, caused by a contraction of quadriceps femoris, evoked by a blow on patellar tendon or in any way that gives the quadriceps a sudden tug. Also referred to as patellar tendon response and knee-kick.

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