sold-out adjective5 •Out of stock. •Completely sold; of which no more is in stock. •Unable to sell an item because no more are in inventory.Sold-out stores can be a major problem around the time of a snowstorm. •Unavailable because all inventory has been sold.The rock star played to dozens of sold-out arenas during his farewell tour. •(figurative) Completely committed or dedicated to a cause, a team, a person, etc.; all in.After a close brush with death, she became a sold-out follower of her faith.