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
This practice counteracts your brain’s obsession with what’s wrong and builds psychological resilience, one moment at a time.
—
Jessica Weiss, CNBC, 20 Dec. 2025
That’s a big advantage, one that may counteract the exhaustion that could catch up to them from doing back-to-back seasons.
—Joe Reid, Vulture, 19 Dec. 2025
To counteract this atmospheric drag and to stay in orbit, the satellite must constantly propel itself forward – like how riding a bike into the wind requires continuous pedaling.
—Sven Bilén, The Conversation, 16 Dec. 2025
The vehicles' audio systems generate sound waves to counteract or eliminate the noise.
—Mark Phelan, Freep.com, 13 Dec. 2025
See All Example Sentences for counteract
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Jessica Weiss, CNBC, 20 Dec. 2025
That’s a big advantage, one that may counteract the exhaustion that could catch up to them from doing back-to-back seasons.
—Joe Reid, Vulture, 19 Dec. 2025
To counteract this atmospheric drag and to stay in orbit, the satellite must constantly propel itself forward – like how riding a bike into the wind requires continuous pedaling.
—Sven Bilén, The Conversation, 16 Dec. 2025
The vehicles' audio systems generate sound waves to counteract or eliminate the noise.
—Mark Phelan, Freep.com, 13 Dec. 2025
See All Example Sentences for counteract
Cite this Entry
“Counteract.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/counteract. Accessed 27 Dec. 2025.
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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