counteract - definition and synonyms

verb [transitive] 

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/ˌkaʊntərˈækt/
present tense
I/you/we/theycounteract
he/she/itcounteracts
present participlecounteracting
past tensecounteracted
past participlecounteracted
  1. to reduce the negative effect of something by doing something that has an opposite effect

    Schools are taking action to counteract bullying.