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
Into the game was lefty reliever Anthony Banda, to counteract Barger, a pinch hitter.
—
Andy McCullough, New York Times, 25 Oct. 2025
But lower rates cannot easily counteract the economic uncertainty that continues to bedevil businesses or address AI’s structural impact on entry-level tech jobs.
—Bryan Mena, CNN Money, 25 Oct. 2025
By engineering support layer architecture, thin-film nanocomposite membranes counteract internal concentration polarization and salt accumulation within the membrane’s porous structure, reducing the driving force for water flow.
—Tejasri Gururaj, Interesting Engineering, 24 Oct. 2025
With Canna Bloom, Letizia and co-owner and founder Stephanie Lembke aimed to counteract this.
—Maia Pandey, jsonline.com, 24 Oct. 2025
See All Example Sentences for counteract
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Andy McCullough, New York Times, 25 Oct. 2025
But lower rates cannot easily counteract the economic uncertainty that continues to bedevil businesses or address AI’s structural impact on entry-level tech jobs.
—Bryan Mena, CNN Money, 25 Oct. 2025
By engineering support layer architecture, thin-film nanocomposite membranes counteract internal concentration polarization and salt accumulation within the membrane’s porous structure, reducing the driving force for water flow.
—Tejasri Gururaj, Interesting Engineering, 24 Oct. 2025
With Canna Bloom, Letizia and co-owner and founder Stephanie Lembke aimed to counteract this.
—Maia Pandey, jsonline.com, 24 Oct. 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 Oct. 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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