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up to

up to

527 2.8
Busy doing something, often secret or causing trouble
  • idiom
  • Informal
: hacer
  • What have you been up to lately? I hope you're not getting into trouble.

This is why because all of the stuff that they're up to is massive.

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Examples

Synonyms

engaged
vsup to
126 3.4

Giving full attention to an activity or idea

can also suggest someone's recent or secret actions when asked
occupied
vsup to
75 1.8

Busy doing something and not free to do other things

can additionally hint at possible mischief rather than just being busy
up to something
vsup to
  • Informal
62 7.0

Doing something secret that may be wrong or harmful

also covers neutral involvement in ordinary activities without secrecy
up to someone's ears in
vsup to
  • Informal
5 7.7

Very busy with more work than you can handle

is more general and can also imply secret or suspicious actions
to busy
vsup to
5 1.0

To keep yourself active by doing something

also can imply secretive or mischievous activity
up to one's ears
vsup to
  • Informal
6.9

Very busy with work or tasks and feeling overwhelmed

is the broader sense that can also suggest secret activity
9.6

Doing small naughty things for fun

is broader and also used simply to mean being occupied

Antonyms

60 2.8

Not working or being used

19 2.5

Not being used or working now

How Busy

swamped with work
  • Informal
2 4.4
up to
  • Informal
527 2.8
occupied
75 1.8
idle
60 2.8

Surface Forms

up to positive

Morphology

up + to

The meaning 'having the necessary qualities or ability' is not a direct compositional result of combining the literal senses of 'up' (movement/position) and the preposition 'to'; the phrase functions as a fixed predicative construction whose sense is partly metaphorical. There is a loose connection to 'up' implying readiness or adequacy (cf. 'up for'), but a B1 learner who only knows the individual words would likely need exposure to this idiomatic use, so it is intermediate in transparency.

Etymology

Up to (when we say someone is up to something) one popular story says it comes from the image of a person going up to a hidden place to work on a secret plan. So if someone is 'up to' something, they are busy with it, often in a way that seems suspicious.