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.
「我沒有吃餅乾，我發誓，否則不得好死，」小孩舉起雙手說道。
“I promise, I will never tell anyone your secret, cross my heart and hope to die,” she whispered.
「我保證，我絕不會告訴任何人你的秘密，我發誓，否則不得好死，」她低聲說道。
“I swear I put the money in a safe place, cross my heart and hope to die!” he said, looking a bit nervous.
「我發誓我把錢放在安全的地方，我發誓，否則不得好死！」他有點緊張地說道。