[cross one's
heart] or [cross one's heart and hope to die] {v.phr.}, {informal} To say that
what you have said is surely true; promise seriously that it is true. - Often
used by children in the longer form. Children often make a sign of a cross over
the heart as they say it, for emphasis.
"Cross my heart, I didn't hide
your bicycle," Harry told Tom.
"I didn't tell the teacher what you said. Cross
my heart and hope to die," Mary said to Lucy.
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