Student or Learner
The following is a paragraph introducing different uses of the word "up":
One two-letter English word has more meanings than any other two-letter English word: up. It means toward the sky or at the top of a list, but when we awaken, we wake up. At a meeting, a topic comes up. We speak up. Officers are up for election and it is up to the secretary to write up a report. We call up friends, dress up, brighten up a room, polish up silver, warm up leftovers, and clean up kitchens. We lock up houses and fix up cars. People stir up trouble, line up for tickets, work up an appetite, and think up excuses. Drains must be opened up when they stop up. We open up a store in the morning and close it up at night. If you are up to it, build up a list of the ways up is used; it will take up a lot of time, but if you don’t give up, you may wind up with a hundred. When it threatens to rain, it clouds up. When the sun comes out, it clears up. When it rains, it wets the earth and often muddies things up. When it doesn’t rain, things dry up. I could go on and on, but my time is up, so I’ll wrap it up since it's time to shut up!
Wherein, the sentence "If you are up to it, build up a list of the ways up is used;", is beyond my understanding. Though I have looked up different dictionaries, I don't understand what the phrase "be up to " means.
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