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react against someone or something

to respond negatively to someone or something. Why did she react against me so strongly? There is no need to react against the plan with such force.
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react to someone or something

to act in response to someone or something. You made some very good points. I would like to take some time to react to you. How did Mary react to the news?
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References in periodicals archive ?
Quantitatively speaking, one molecule of water can react with two molecules of isocyanate.
When we react, the first action is to wall off the problem, to categorize it.
Moreover, pinene reacts with ozone to form pinol, which combines with water to form a hydrate that has a melting point higher than the boiling point of water.
Upon postcuring, additional isocyanate can react with the urea to give biuret or with the urethane to give allophanate.
Other plants react to the insect polymer called chitin.
2] observed in the pump residue indicates that some gaseous, liquid and solid products of degassing can flow along the furnace launder system and react with other elements and compounds, both from the melt and the refractory material.
The 8600 series reacts instantly to protect the network," said Philip Yim, Allied Telesyn Executive Vice President of Marketing and Product Development.
When sulfur dioxide--which reacts with water vapor in the air to form sulfuric acid--wasn't abundant over Houston, the aerosols weren't so prevalent.
This O, in turn, reacts with the dissolved Mg, forming Mg oxide that then floats out of the molten iron.
Imagine a cell phone that reacts to gestures, or projects its own `virtual' keyboard on any convenient surface," he said.
The O in the air reacts with the exposed MgS on the side walls and above the molten iron in accordance with the following reaction:
It is plain that the insurance industry deliberately has made the situation so intolerable that the nursing home industry as a whole - good operators and bad - reacts in the expected Pavlovian way: blame the lawyers.
It reacts with many things, not just Amadori products.
If this oxide reacts with the various refractory systems, refractoriness is lowered, dropping the service temperature of the refractory.