go on the block
To make something available for purchase. The "block" in this phrase is the "auction block," the platform that an auctioneer stands on to sell something. If my jewelry goes on the block after I die, I'll come back and haunt all of you!
go on the block
Fig. [for something] to go up for auction; [for something] to be placed on the auction block. Our farm went on the block last week. Got a good price. When this painting goes on the block, I hope I get a lot for it.
go on the block
To be offered for sale.