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up for

part of speech: phrase
definition 1: (informal) eager or willing to engage in something.
Alan suggested we all go bowling. I'm up for it. What about you?We'd just had pizza a few days ago, so I wasn't up for having it again last night.
definition 2: participating as a candidate for election to a particular public office.
Did you know that she was up for city council president?
definition 3: of a political office, available to be filled.
Thirty-four Senate seats are up for election in November.
definition 4: required to seek election again, if desired.
The mayor is up for reelection next year, so he's doing his best to get public support.