1. willing or able to try, open to
up for discussion/consideration/it
'Up for' is a phrase of 'up' that can have a number of meanings. 'Up for' can mean 'available for', such as in the phrase 'up for sale' or 'up for discussion'. 'Up for' can also mean 'to be considered for', so someone might be 'up for promotion' for example. Something can also be 'up for renewal' or 'up for review' which means 'due for'. An informal meaning of 'up for' is to be eager for something or be prepared to do or try something, this is used more often in casual contexts.