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react

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react/riˈækt/verb
reactsreactedreacting
react
/riˈækt/
verb
reactsreactedreacting
Learner's definition of REACT  
[no object]
: to behave or change in a particular way when something happens, is said, etc. — often + to
— see also overreact
of a chemical substance  : to change after coming into contact with another substance — often + with — often + together
medical  : to be affected by a drug, food, etc., in usually a bad way

react against

[phrasal verb]
react against (someone or something) 
: to do things that are opposed to (something or someone that you disagree with)
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