Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “swear by sth”

swear by sth

phrasal verb with swear     /sweər/ verb (past tense swore, past participle sworn)
to believe strongly that something is useful or effective: Have you tried using vinegar to clean windows? My Mum swears by it.Believing
(Definition of swear by sth from the Cambridge Learner's Dictionary © Cambridge University Press)

Translations of “swear by sth”

Word of the Day

touch

an ability to do things in the stated, especially positive, way

Word of the Day

Blog

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