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English definition of “swear by sth”

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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 Learners Dictionary © Cambridge University Press)
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