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in sentence "what are you up to", what is the definition of "up" and what part of speech is it?

there are way too many definitions for "up", I am not sure which one "up" is using in above sentence.

does "up" has to be used together with "to" to work?

my question is, is "up" here a adjective or adverb?

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be up to sth

to be doing something:

What are you up to at the moment?

https://dictionary.cambridge.org/us/dictionary/english/be-up-to-sth

  • so it is an idiomatic expression – aggressionexp Apr 12 at 23:53
  • It is. At least where I live in the US. – Kaique Apr 12 at 23:54

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