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
1.

sumpah mati, aku bersumpah

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

:
I promise I won't tell anyone, cross my heart.
Aku janji tidak akan memberitahu siapa pun, sumpah mati.
He said he'd be there on time, cross his heart and hope to die.
Dia bilang dia akan tiba tepat waktu, sumpah mati.