What does "apple of my eye" even mean?

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Music by Eric Matyas
https://www.soundimage.org
Track title: Music Box Puzzles

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Chapters
00:00 What Does &Quot;Apple Of My Eye&Quot; Even Mean?
00:18 Accepted Answer Score 13
02:50 Answer 2 Score 6
03:26 Thank you

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Full question
https://english.stackexchange.com/questi...

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Tags
#idiommeaning

#avk47