what does "up" means here in "what are you up to"

Question

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?

Kaique · Accepted Answer · 2019-04-12 23:34:03Z

1

be up to sth

to be doing something:

What are you up to at the moment?

answered Apr 12, 2019 at 23:34

Kaique

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so it is an idiomatic expression
– aggressionexp
Commented Apr 12, 2019 at 23:53
It is. At least where I live in the US.
– Kaique
Commented Apr 12, 2019 at 23:54

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