swears
v.
诅咒，咒骂( swear的第三人称单数 );
（使某人）就…宣誓;
郑重承诺;
发誓要;
例句:
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My father swears by these vitamin pills.
我爸爸非常相信这些维他命药片.
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A witness swears by the Bible that he will tell the truth.
证人对着圣经发誓保证据实直言.
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He swears by his doctor.
他极信任他的医生.
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He swears his family lets them down every night.
来自THETIMES
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Rather than relieving pain, when someone swears this individual FEELS pain.
来自SA
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Josh Wood, whose clients include Elle Macpherson, swears by them.
来自THETIMES