If you overspend, you spend more money than you can afford to. Don't overspend on your home and expect to get the money back when you sell I overspent by £1 on your shopping so I'm afraid you owe me He argued that local councils which overspend should be forced to face fresh elections
If an organization or business has an overspend, it spends more money than was planned or allowed in its budget. Efforts are under way to avoid a £800,000 overspend. to spend more money than you can afford