up to
up to {prep.}
1. As far, as deep, or as high as.
The water in the pond was only up to John's knees.
Mary is small and just comes up to Bill's chest.
The shovel sank in the soft mud all the way up to the handle.
2. Close to; approaching.
The team did not play up to its best today.
Because of the rain, the number of people at the party didn't come up to the number we expected.
3. As high as; not more than; as much or as many as.
Pick any number up to ten.
There were up to eight fire engines at the fire.
Up to her fourth birthday, the baby slept in a crib.
Up to now I always thought John was honest.
We went swimming up till breakfast time.
Up until last summer we always went to the beach for our vacation.
5. Capable of; fit for; equal to; strong or well enough for.
We chose Harry to be captain because we thought he was up to the job.
Mother is sick and not up to going out to the store.
6. Doing or planning secretly; ready for mischief.
What are you up to with the matches, John?
Mrs. Watson was sure that the boys were up to no good, because they ran when they saw her coming.
7. Facing as a duty; to be chosen or decided by; depending on.
It's up to you to get to school on time.
I don't care when you cut the grass. When you do it is up to you.
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Source: A Dictionary of American Idioms