swear by

1. (transitive)To invoke in an oath; to swear upon.

2. (idiomatic, transitive)To trust wholeheartedly.

   I swear by my Petit Larousse when it comes to learning French.

   He swears by cream of tartar to make the meringues stiff.

   auf etwas schwören

1. I swear by what is written.

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2. I'm sorry I can't swear by him.

   ruИзвините, но я не могу на него положиться. — Hellerick

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3. We have nothing left to swear by now.

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4. I swear by God that I will speak the truth.

   ruКлянусь Богом, что я буду говорить правду. — odexed

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5. I swear by my kids.

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irregular · Lesson

• swear outслужити, обслуговуватиTo obtain (a warrant or the like) by swearing to facts.
• swear offTo quit or cease completely, or to promise to quit, as a bad habit.
• swear inTo administer an oath to, as an oath of office or of citizenship.
• swear downTo promise that something is (not) true.
• swear byTo invoke in an oath; to swear upon.