To seize the positions of and defeat conclusively: The position of the forward infantry was overrun by large numbers of enemy troops at dawn. To spread or swarm over destructively: Locusts overran the prairie. To spread swiftly throughout: The new fashion overran the country. To overflow: The river overran its banks. To run beyond or past; overshoot: The plane overran the end of the runway. To run or extend beyond (a limit); exceed: Your speech has overrun the time limit. Printing To rearrange or move (set type or pictures) from one column, line, or page to another. Printing To set too much type for. Printing To print (a job order) in a quantity larger than that ordered. To run over; overflow. To go beyond the normal or desired limit. An act of overrunning. The amount by which something overruns. The exceeding of estimated costs for product development and manufacture covered by contract. The amount by which actual costs exceed estimates. Printing A run over and above the quantity ordered by a customer.