What is the meaning cross my heart and hope to die (CHAPTER - The Louse And The Mosquito)

it means-- "used to emphasize the truthfulness of a personand sincierity of what one is saying"
 

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IT MEANS USED TO EMPHASISE OF  TRUTH FULLNESS OF A PERSON AND SINCERITY OF WHAT ONE IS SAYING 
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Said to show that what you have said or promised is true and sincere
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It shows that what you have promised it true and sincere
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