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Definitions

strengthen

[strengk-thuhn, streng-, stren-] / ˈstrɛŋk θən, ˈstrɛŋ-, ˈstrɛn- /
VERB
make more forceful, powerful
Synonyms
STRONGEST
bolster build up enhance enlarge establish extend heighten increase intensify invigorate reinforce restore set up step up support sustain toughen
STRONG
add anneal ascend brace buttress confirm corroborate empower fortify harden justify mount multiply regenerate rejuvenate renew rise steel substantiate temper tone wax
WEAK
add fuel to fire make firm sinew tone up
Antonyms
STRONGEST
abridge condense curtail decrease destroy diminish halt hinder lessen let down lower reduce shrink slow subtract undermine weaken
STRONG
contradict decline deny descend disprove drop fall kill reject ruin slump soften
WEAK
break down discourage dishearten dissuade hurt
VERB
encourage, hearten
Synonyms
STRONGEST
consolidate invigorate restore toughen uphold
STRONG
animate back bloom brace burgeon cheer embolden enliven flourish flower fortify gird harden inspirit nerve nourish prepare prosper rally ready refresh rejuvenate steel substantiate temper thrive
WEAK
back up bear out brace up carry weight enhearten gather resources give weight
Antonyms
STRONG
discourage dishearten dissuade fail kill languish let go lose neglect ruin shrink shrivel soften weaken
WEAK
break down hurt

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.

In a post on X, he said his visit was to "strengthen the protection of lives".

From BBC • May 2, 2026

Being short USD/JPY means investors are betting that the dollar will fall in value against the yen, or that the yen will strengthen against the greenback.

From MarketWatch • May 2, 2026

"We would like Middle Eastern states to also give us an opportunity to strengthen ourselves," Zelensky recently told French newspaper Le Monde.

From BBC • May 2, 2026

On Thursday, Australia and its top diesel supplier, South Korea, said the countries are working together to strengthen fuel security.

From The Wall Street Journal • May 1, 2026

The queen believed that kinship would strengthen their bond and ensure Mark Antony’s devotion to her cause.

From "Sterling Biographies®: Cleopatra: Egypt's Last and Greatest Queen" by Susan Blackaby

Vocabulary lists containing strengthen

President Obama's second inaugural address

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Spelling Practice, Unit 2

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