overdraft āļāļ·āļāļāļ°āđāļĢ overdraft āļāļ·āļāļāļ°āđāļĢ The act of overdrawing a bank account.The amount overdrawn.The maximum amount of credit extended to a customer.A current of air made to pass over the ignited fuel in a furnace.A series of flues in a brick kiln designed to force air down from the top.The air so forced.