1 is alliteration.
2 is onomatopoeia.
3 is personification.
It is a saying that children use to make a promise. They will draw an X<span> over their heart with their finger and say </span> "Cross my heart, hope to die."<span> They may also add </span>"stick a needle in my eye."<span> to make the promise stronger. This shows that they are extremely serious about it.</span>
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