swear by

US /swer baɪ/
UK /swer baɪ/
"swear by" picture
1.

〜を信じる, 〜が効くと信じる

to believe strongly in the effectiveness or truth of something

:
My grandmother swears by this herbal remedy for colds.
私の祖母は風邪にはこの漢方薬が効くと信じている
Many chefs swear by fresh, local ingredients.
多くのシェフは新鮮な地元の食材が最高だと信じている