reacting
v.v. to behave or change in a particular way because of something that has happened. You use this when you describe how someone feels or what they do after hearing news or being touched.
v. behaving in a specific manner in response to an external stimulus or situation. Often describes a chemical change when two substances are combined or a physiological response to a drug.
She is reacting well to the new medicine.
The market is reacting poorly to the news of the interest rate hike, with stocks falling across the board.
By reacting immediately to the sensor's data, the automated system prevented a total engine failure that would have cost the company millions in repairs.
Often takes the preposition 'to' followed by the stimulus.
He was reacting at the newsHe was reacting to the newsThe verb 'react' typically pairs with the preposition 'to' rather than 'at' or 'on'.