swear by sth definition, meaning - what is swear by sth in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online

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swear by sth

informal
phrasal verb with swear uk   /sweər/  us   /swer/ verb (swore, sworn)
to believe strongly that something is effective or useful: My dad swears by these vitamin pills.
(Definition of swear by sth from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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