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to swear by
[phrase form: swear]
01
to be certain that something is good or useful
Example
Many athletes swear by the benefits of proper hydration for peak performance.
My grandmother swears by the traditional remedy of honey and lemon for a sore throat.
She swears by the healing properties of herbal tea for relieving stress.
He swears by the effectiveness of a daily exercise routine for maintaining good health.
She swore by the Bible that she was telling the truth.
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