To sell an item to the highest bidder. We're auctioning off a car at the charity event this year.
auction something off
to sell something [to the highest bidder] at an auction. He auctioned his home off.He auctioned off his home.The duke was forced to auction off his ancestral home to pay his taxes.
auction off
v.
To sell something to the person who offers the highest amount of money, at or as at an auction: We don't need this table anymore, so we should auction it off. To clear out the warehouse, the company auctioned off the old inventory.