strengthen
Americanverb
Other Word Forms
Etymology
Origin of strengthen
First recorded in 1250–1300, strengthen is from the Middle English word strengthnen. See strength, -en 1
Explanation
To strengthen is to make something stronger! Rarr. You can strengthen your muscles by working out, or strengthen your brain by learning new words. Anytime you strengthen something, you're making it more resistant, vigorous, or tough. Taking vitamins can strengthen your immune system so you don't get sick. Lifting weights will strengthen your muscles. A powerful lock will strengthen a door. On computers, a reliable firewall will strengthen your virus protection. If something is weak, it needs to be strengthened. Congrats! You just strengthened your vocabulary by checking out this definition!
Vocabulary lists containing strengthen
President Obama's second inaugural address
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Spelling Practice, Unit 2
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Communication between neurons weakened, reducing the brain's capacity to strengthen important neural connections.
From Science Daily • May 30, 2026
But Ben Brake, director general of DOT Europe, whose members include Amazon and Apple, said "retaliating against US corporations in response to trade disputes will neither drive innovation nor strengthen Europe's competitiveness".
From Barron's • May 30, 2026
A plan to strengthen California’s climate program faces pushback as industry groups and some lawmakers warn the changes could drive up already-high energy costs.
From Los Angeles Times • May 30, 2026
The Gunners' summer plans to strengthen to "stay top of the mountain"
From BBC • May 28, 2026
But I am telling you—you who know so much about interrogating people and observing the hidden meaning of their hearts—I am telling you; I think she might have looked away to strengthen herself.
From "The Many Assassinations of Samir, the Seller of Dreams" by Daniel Nayeri
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
