Dic: up to (some of its usages)

• He's not up to the job.
• I don't feel up to going to work today.
• Those patients who were up to it could move to the adjacent pool.
• His fellow-directors were not up to running the business without him.

4. (also up to doing something) △physically or mentally capable of something
1. PREP-PHRASE : PREP n/-ing △If you feel up to doing something, you are well enough to do it.

* * *

• Her latest book isn't up to her usual standard. 
• Up to twenty thousand students paid between five and six thousand dollars.
• It could be up to two years before the process is complete. 
• My own souffles aren't up to much.

3. △as high or as good as something.
5. PREP-PHRASE : PREP amount △You use up to to say how large something can be or what level it has reached.
6. PHRASE : v-link PHR △If you say that something is not up to much, you mean that it is of poor quality.[ BRIT, INFORMAL ]

.... OALD, COBUILD

CF: Dic: up to something, Dic: feel up to, be up to

CF. up to:

• a) devising or scheming; occupied with: she's up to no good.
• b) dependent or incumbent upon: the decision is up to you.
• c) equal to (a challenge, etc.) or capable of (doing, etc.): are you up to playing in the final?
• d) aware of: up to a person's tricks.
• e) as far as: up to his waist in mud.
• f) as many as: up to two years' waiting time.
• g) comparable with: not up to your normal standard.

.... Collins English