What is another word for swear for?
Pronunciation: [swˈe͡ə fɔː] (IPA) 
Swear for, or to testify or confirm something with an oath or promise, has several synonyms, including vow, affirm, pledge, declare, testify, guarantee, and assure. Swearing for something is usually done to express the seriousness of a statement or to provide assurance that one is telling the truth. A vow is a solemn promise made under oath, while an affirmation is a solemn declaration of truth. Pledge is a similar term that denotes a promise or commitment made on one's honor. Declare means to state something with emphasis or clarity, and testify means to provide evidence or bear witness to something. Guarantee and assure both indicate a promise of certainty or confidence in something.
