swear by
The phrase "swear by" is used both in formal contexts, such as making oaths, and informally to express strong confidence in something's effectiveness or reliability.
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Definition
C1Formal
(formal)To invoke a sacred entity as a witness when making a serious promise.
Example
- He swore by the Bible to tell the truth in court.
B2Informal
(informal)To have strong confidence in the effectiveness or reliability of something.
Example
- She swears by this brand of coffee for a perfect start to her day.
- Many athletes swear by this training method.
Similar
Terms that have similar or relatively close meanings to "swear by":
swear downswear atupon my wordpinky swearon one's honorcross one's heart