Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English


English definition of “strengthen”


verb [I/T] (BECOME POWERFUL)   /ˈstreŋk·θən, ˈstreŋ-/
to become more powerful or more difficult to break , or to make something stronger : [T] If something isn’t done to strengthen the railroad bridge , it may collapse . [I] The tone of her voice strengthened suddenly . [T] Exercise will strengthen your legs .
(Definition of strengthen verb (BECOME POWERFUL) from the Cambridge Academic Content Dictionary © Cambridge University Press)
Focus on the pronunciation of strengthen

More American English definitions for “strengthen”

Definitions of “strengthen” in other dictionaries

Word of the Day


a skilled and trained cook who works in a hotel or restaurant, especially the most important cook

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More