be up for grabsif a job, prize, opportunity is up for grabs, it is available for anyone who wants to try to have it
 [TahlilGaran] Dictionary of Contemporary English ▲
 up for grabs adj. phr., 
informal Available for anyone to try to get; ready to be competed for; there for the taking. 
 When the captain of the football team moved out of town, his place was up for grabs.
 When the captain of the football team moved out of town, his place was up for grabs.  [TahlilGaran] English Idioms Dictionary ▲