swear by sth Definition in the Cambridge English Dictionary
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Definition of “swear by sth” - English Dictionary

Definition of "swear by sth" - British English Dictionary

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swear by sth

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