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Definition of knee-jerk adjective from the Oxford Advanced Learner's Dictionary

knee-jerk

adjective
 
/ˈniː dʒɜːk/
 
/ˈniː dʒɜːrk/
[only before noun] (disapproving)
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  1. produced in reaction to something, without any serious thought
    • It was a knee-jerk reaction on her part.
    Oxford Collocations DictionaryKnee-jerk is used with these nouns:
    • decision
    • reaction
    • rejection
    See full entry
See knee-jerk in the Oxford Advanced American Dictionary
era
noun
 
 
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B2
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