Idioms title

The Idiom Attic - a collection of hundreds of English idioms, each one explained.

The meaning of "knee jerk reaction"

" Knee jerk reaction "
A quick and automatic response.
When Isis bombed Paris the knee-jerk reaction was to bomb them back.
Where did it originate?:
Britain, 19th century. Driving from the medical test involving tapping the knee.
Where is it used?:
Hear the idiom spoken:
More idioms about:   the_human_body   medical   excess  

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