REACT

[verb] [I] - to act in a particular way as a direct result of something elseHow did she react when you told her you were leaving?She slapped him and called him names, but he didn't react.The judge reacted angrily to the suggestion that it hadn't been a fair trial.He reacted against (= intentionally behaved in a different way from) everything he had been taught.Many people react (badly) to (= are made ill by) penicillin.This perfume seems to have reacted (= had a bad effect) on my skin. [I](specialized) Potassium reacts (= changes when mixed) with water.