Meaning of the word "cross my heart (and hope to die)" in English

What does "cross my heart (and hope to die)" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

cross my heart (and hope to die)

US /krɔs maɪ hɑrt (ænd hoʊp tu daɪ)/
UK /krɔs maɪ hɑrt (ænd hoʊp tu daɪ)/
"cross my heart (and hope to die)" picture

Idiom

1.

used to emphasize that one is telling the truth or making a sincere promise

Example:
I promise I won't tell anyone, cross my heart.
He said he'd be there on time, cross his heart and hope to die.
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