up to something

1) used for saying the most that an amount can be, or what level it can reach

Some dinosaurs were up to twenty-seven metres long.

Children are forced to work up to 19 hours a day, 7 days a week in the factories.

We can guarantee 90 per cent of a bank loan up to £155,000.

2) used for stating a particular standard something can reach

Employees face dismissal if they fail to match up to the standards set by the company.

I'm afraid the play wasn't up to our expectations.

3) doing something wrong or secret

When he's quiet like this, I know he's up to something.

I wondered what my daughter was really up to.

be up to no good:

I don't know what they're doing but I'm sure they're up to no good.

4) well enough, strong enough, or good enough to do something

She's supposed to leave the hospital tomorrow, but I don't think she's up to it.

He's not really up to the job.

up to doing something:

I don't think I'm up to doing a ten-mile walk.