up to

1. Occupied with, engaged in, as in What have you been up to lately? This usage can mean “devising” or “scheming,” as in We knew those two were up to something . It also appears in up to no good , meaning “occupied with or devising something harmful,” as in I'm sure those kids are up to no good . [First half of 1800s]

2. As far as or approaching a certain point. For example, The water was nearly up to the windowsill , or They allowed us up to two hours to finish the test , or This seed should yield up to 300 bushels per acre . [c. a.d. 950]

3. Dependent on, as in The success of this project is up to us . [c. 1900] Also see the following idioms beginning with up to .

4. be up to . Be able to do or deal with, as in When I got home, she asked if I was up to a walk on the beach . This usage is often put negatively, that is, not be up to something , as in He's not up to a long drive . [Late 1700s]

Example Sentences

A parent or person with lawful custody has up to 14 days from the time of surrender to reclaim the newborn if they change their mind.

From Los Angeles Times

What is clear is that whoever comes into power will be under massive pressure to perform and live up to their campaign promises.

From BBC

My ride companion, The Times’ senior editor for video Mark Potts, remarked that it felt like going up to heaven.

From Los Angeles Times

Hunt said the investigations were ongoing and that “some of these cases can take up to a year to resolve.”

From Los Angeles Times

It is one of the most common types of brain tumours in adults, affecting up to 4,000 people a year in the UK, and has poor survival rates.

From BBC