B2 to act in a particular way as a direct result of something else:
The judge reacted angrily to the suggestion that it hadn't been a fair trial.
Many people react (badly) to (= are made ill by) penicillin.
› chemistry to change in a physical or chemical way when put with another substance:
Potassium reacts with water.
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Thesaurus: sinônimos e palavras relacionadas