Princeton's WordNet

1. up to(adj)

   busy or occupied with

   "what have you been up to?"; "up to no good"

2. adequate to(p), capable, equal to(p), up to(p)(adj)

   having the requisite qualities for

   "equal to the task"; "the work isn't up to the standard I require"

Wiktionary

1. up to(Preposition)

   Against; next to; near; towards; as far as.

2. up to(Preposition)

   Capable of.

3. up to(Preposition)

   As much as; no more than.

4. up to(Preposition)

   For the option or decision of.

5. up to(Preposition)

   Doing; involved in (with implications of mischief).

6. up to(Preposition)

   Incumbent upon; the obligation of; the duty of.

7. up to(Preposition)

   Considering all members of an equivalence class the same.

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