Definition of kick in phrasal verb from the Oxford Advanced American Dictionary

 

kick in

 phrasal verb
phrasal verb
 
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Phrasal Verbs

    kick in

    (informal)
     
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  1. 1to begin to take effect Reforms will kick in later this year.
  2. 2 (also kick in something) to give your share of money or help
See the Oxford Advanced Learner's Dictionary entry: kick in