Definition
Used to emphasize that what one has just said or promised is absolutely true and sincere.
(表示诚意)我以诚心誓誓
"I didn't eat the cookies, cross my heart and hope to die," the child said, holding up his hands.
「我没有吃饼干，我发誓，否则不得好死，」小孩举起双手说道。
“I promise, I will never tell anyone your secret, cross my heart and hope to die,” she whispered.
「我保证，我绝不会告诉任何人你的秘密，我发誓，否则不得好死，」她低声说道。
“I swear I put the money in a safe place, cross my heart and hope to die!” he said, looking a bit nervous.
「我发誓我把钱放在安全的地方，我发誓，否则不得好死！」他有点紧张地说道。