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to swear by
[phrase form: swear]
01
を信じる
to be certain that something is good or useful
例
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.
He swears by the effectiveness of the new fitness tracker.
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.
