knee-jerk

2 ENTRIES FOUND:

knee–jerk

adjective \ˈnē-ˌjərk, -ˈjərk\

: occurring quickly and without thought

: often reacting quickly and without thought

Full Definition of KNEE-JERK

:  readily predictable :  automatic <knee–jerk reactions>; also :  reacting in a readily predictable way <knee–jerk liberals>

First Known Use of KNEE-JERK

1951

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