counteract
verb
coun·ter·act
ˌkau̇n-tər-ˈakt 
counteracted; counteracting; counteracts
: to make ineffective or restrain or neutralize the usually ill effects of by means of an opposite force, action, or influence
a drug used to counteract fatigue
Examples of counteract in a Sentence
The drug will counteract the poison.
this medication will counteract the symptoms but it won't kill the infection
Recent Examples on the Web
To counteract the large numbers, the company changed its policy to make the reward a BOGO meal.
—
Pj Green, Kansas City Star, 7 May 2026
His versatility also allows for some creative packages if defensive coordinator Brian Flores wants to feature different body types to counteract offenses using heavier personnel.
—Alec Lewis, New York Times, 4 May 2026
Gustafson said the company expects this growth to continue as more people begin taking GLP-1s and searching for products to prevent or counteract hair thinning.
—Laya Neelakandan, CNBC, 2 May 2026
Taking the supplement, however, is thought to counteract those effects.
—Angelica Bottaro, Verywell Health, 1 May 2026
See All Example Sentences for counteract
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Pj Green, Kansas City Star, 7 May 2026
His versatility also allows for some creative packages if defensive coordinator Brian Flores wants to feature different body types to counteract offenses using heavier personnel.
—Alec Lewis, New York Times, 4 May 2026
Gustafson said the company expects this growth to continue as more people begin taking GLP-1s and searching for products to prevent or counteract hair thinning.
—Laya Neelakandan, CNBC, 2 May 2026
Taking the supplement, however, is thought to counteract those effects.
—Angelica Bottaro, Verywell Health, 1 May 2026
See All Example Sentences for counteract
Cite this Entry
“Counteract.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/counteract. Accessed 10 May. 2026.
Copy CitationKids Definition
counteract
verb
coun·ter·act
ˌkau̇nt-ə-ˈrakt
: to lessen the force, action, or influence of : offset
a drug that counteracts a poison
Medical Definition
counteract
transitive verb
coun·ter·act
ˌkau̇nt-ə-ˈrakt
: to make ineffective or restrain or neutralize the usually ill effects of by an opposite force
vitamin K counteracts the effects of warfarin
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