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English definition of “knee-jerk”

knee-jerk

adjective uk   /ˈniː.dʒɜːk/ us    /-dʒɝːk/ disapproving
knee-jerk reaction, response, etc. a quick reaction that does not allow you time to consider something carefullyHabitual and customary
(Definition of knee-jerk from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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