to cross one's heart
cross
krɒs
kros
<i>one's</i>
wʌnz
vanz
heart
hɑ:t
haat

英語での「cross one's heart」の定義と意味

to cross one's heart
01

to swear that one is telling the truth about something or is going to do something as promised 

慣用句
くだけた
例
She crossed her heart and promised to keep the secret safe, vowing never to reveal it to anyone. 
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