What does "What are you up to?" mean?

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Music by Eric Matyas
https://www.soundimage.org
Track title: Mysterious Puzzle

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Chapters
00:00 What Does &Quot;What Are You Up To?&Quot; Mean?
00:16 Accepted Answer Score 40
00:46 Answer 2 Score 10
01:19 Answer 3 Score 2
01:36 Answer 4 Score 1
01:51 Answer 5 Score 0
02:02 Thank you

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Full question
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Tags
#idioms

#avk47