Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English


English definition of “run down (someone/something)”

run down (someone/something)

(WEAKEN) phrasal verb with run    /rʌn/ verb (present participle running, past tense ran  /ræn/, past participle run)
to lose energy , power , or strength : By 1923 the radio boom seemed to be running down.
(Definition of run down (someone/something) (WEAKEN) from the Cambridge Academic Content Dictionary © Cambridge University Press)
Focus on the pronunciation of run down (someone/something)

Word of the Day


to pour liquid slowly over something, especially in a thin line or in small drops

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