to be doing or planning something, often something secret, mischievous, or suspicious; to be sb's duty or responsibility; to be for sb to decide; to reach as far as a stated level, or to be as many as a stated maximum
Editorial56% of films
to be doing or planning something, often something secret, mischievous, or suspicious
Oxford22% of films
to be sb's duty or responsibility; to be for sb to decide
Which one will be up to you.
That'’ll be up to you, not me.
Editorial22% of films
to reach as far as a stated level, or to be as many as a stated maximum
I'll call Kaye, and by noon Washington will be up to its knees in Olympia.
Definitions from the Oxford Advanced Learner's Dictionary, 9th edition