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Phrase(s): *up for something
1. Fig. [of someone] mentally ready for something. (*Typically: be ~; get ~; get oneself ~.) • The team is up for the game tonight. • We are all up for the contest. 2. Sl. agreeable to something. (*Typically: be ~.) • I’m up for a pizza. Anybody want to chip in? • Who’s up for a swim?
McGrawhill's American Idioms And Phrasal Verbs