Pronunciation: (
v., -ran, -run, -run•ning,

1. to rove over (a country, region, etc.); invade; ravage: a time when looting hordes had overrun the province.
2. to swarm over in great numbers, as animals, esp. vermin; infest: The house had been overrun by rats.
3. to spread or grow rapidly over, as plants, esp. vines, weeds, etc.: a garden overrun with weeds.
4. to attack and defeat decisively, occupying and controlling the enemy's position; overwhelm.
5. to spread rapidly throughout, as a new idea or spirit: a rekindling of scholarship that had overrun Europe.
6. to run or go beyond, as a certain limit: The new jet overran the landing field.
7. to exceed, as a budget or estimate: to overrun one's allotted time.
8. to run over; overflow: During the flood season, the river overruns its banks for several miles.
9. Print.
a. to print additional copies of (a book, pamphlet, etc.) in excess of the original or the usual order.
b. to carry over (type or words) to another page.
10. Naut.
a. to sail past (an intended stopping or turning point) by accident.
b. (of a ship) to complete (a schedule of calls) more rapidly than anticipated.
11. to outrun; overtake in running.

1. to run over; overflow: a stream that always overruns at springtime.
2. to exceed the proper, desired, or normal quantity, limit, order, etc.: Do you want to overrun on this next issue?

1. an act or instance of overrunning.
2. an amount in excess; surplus: an overrun of 10,000 copies of a new book.
3. the exceeding of estimated costs in design, development, and production, esp. as estimated in a contract: a staggering overrun on the new fighter plane.
4. the amount exceeded: an overrun of $500,000 for each fighter plane.
5. a run on an item of manufacture beyond the quantity ordered by a customer and often offered at a discount.
6. the amount by which the volume of a food, as butter or ice cream, is increased above the original volume by the inclusion of air, water, or another substance: With only a 20 percent overrun, this is an excellent ice cream.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

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