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swear by
Also, swear to . Have reliable knowledge of, be sure of, as in I think she was going to the library but I can't swear to it . [Mid-1700s]
Take an oath by, as in I swear by all the saints in heaven . [Early 1200s]
Have great reliance on or confidence in, as in She swears by her personal physician . [Early 1800s]
Example Sentences
Some folks swear by store-bought for convenience — and fair enough.
Those who swear by the ingredient say it’s a natural moisturizer with several benefits, including fighting acne — asserting it has anti-inflammatory properties — and protecting the skin barrier to lock in hydration.
While some people swear by their lucky numbers, there is little rhyme or reason behind purchasing a winning ticket.
"If the crust starts to get too dark, I swear by a ring of foil wrapped around the crust to protect it. You can keep them and reuse them many times too."
Many athletes swear by it, including Michael Phelps and Olympic gymnast Alex Naddour.
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