to be sb's duty or responsibility; to be for sb to decide; as far as a particular number, level, etc.
be up to sb
to be sb's duty or responsibility; to be for sb to decide
It's not up to you to tell me how to do my job.
up to sth
as far as a particular number, level, etc.
I can take up to four people (= but no more than four) in my car.
up to sth
not further or later than sth; until sth
Read up to page 100.
up to sth
as high or as good as sth
Her latest book isn't up to her usual standard.
up to sth
physically or mentally capable of sth
He's not up to the job.
up to sthinformal
doing sth, especially sth bad
What's she up to?
Definiciones del Oxford Advanced Learner's Dictionary, 9.ª edición