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

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.