counteract
v.to do something that reduces or stops the bad effect of something else. You use this when you want to balance out a negative situation.
v.to act in opposition to something in order to neutralise its effect. Often implies the application of a corrective force or substance to mitigate a negative impact.
“Drinking water helps to counteract the effects of the heat.”
“The government introduced new tax breaks to counteract the recent decline in consumer spending.”
“To counteract the rising acidity of the soil, the farmers applied a layer of crushed limestone across the fields before the spring planting began.”
The verb is transitive and requires a direct object.
“But less well-known is sulphur pollution, which forms vast numbers of tiny particles in the air and reflects sunlight back into space, partly counteracting the warming effect of carbon.”
“An attractive force pulling the particles together is precisely counteracted by pressure produced by the fermions, keeping the droplet from collapsing.”
From counter- + act.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.