knee-jerk

n 1 involuntary jerk of the leg when a tendon below the knee is struck 膝反射. 2 [attrib 作定语] (fig derog 比喻, 贬) done or produced automaticallyand without thought 自动的; 不经思考而做的: a knee-jerk reaction to the mention of Communism 一提共产主义就不加思索做出的反应.

klaxon, Kleenex, kleptomania, kleptomaniac, km, kn, knack, knacker, knacker's yard, knackered, knapsack, knave, knavery, knavish, knavishly, knead, knee, knee-breeches, knee-deep, knee-high, knee-length, kneecap, kneecapping, kneel, kneel down, knees-up, knell, knew, knick-knack (also nick-nack), knickerbockers, knickers, knife, knife-edge, knight, knight errant (pl knights errant), knighthood, knightly, knit, knitter, knitting,