be up for something—
1. (of a house, car, etc.) intended for sale or repairs:
- How long has this house been up for sale?
2. be considered for a position, a job, etc.:
- I believe he’s up for re-admission to the society at the next committee meeting.
3. facing criminal charges:
- I hear the gardener is up for the robbery at the big house.
4. (coll.) willing to do smth. or interested in doing smth.:
- If you’re up for straight drinking, go to an izakaya, usually explained as a Japanese pub.
Note: The expression does not correlate in meaning with the phrase be hard up for something—be short of smth.; not have enough of smth.:
- I was hard up for cash so I was willing to do whatever I could, within reason.
be up to something—
1. feel well enough or be able to do smth.:
- Mother hasn’t been up to much recently, while her leg was bad.
2. be about to engage in smth. mischievous or reprehensible:
- I felt sure he was up to no good when I saw him hanging about the back door.
3. be well aware of smb.’s dishonest tricks, etc.:
- But surely, all that’s taken care of by the customs authorities? They must be up to all the dodges.
4. equal smth. in standard:
- I wonder whether his latest book was up to your expectations?
See also: be down for something / be down to something.