Definition: to make a serious promise Level: B2
我对发生的事情一无所知，我发誓。
I don't know anything about what happened, I ___swear.
她信誓旦旦地说她不知道钱怎么了。
She ___swore blind she didn't know what had happened to the money.
在一些国家，法庭上的证人必须手按圣经发誓。
In some countries, witnesses in court have to ___swear on the Bible.
