noun.
Any loss of advantage or impairment of profit, value, success, or satisfaction; a discouragement or hindrance; a disadvantage.
noun.
Money or an amount paid back; usually, a certain amount of duties or customs dues paid back or remitted to an importer when he exports goods that he has previously imported and paid duty on, as, for instance, tobacco, or a certain amount of excise paid back or allowed on the exportation of home manufactures. Abbreviated dbk.
noun.
In iron-founding, a loose piece in a mold. In brass-founding such a piece is called a false core.