[v. oh-ver-ruhn; n. oh-ver-ruhn]
verb (used with object), overran, overrun, overrunning.
to rove over (a country, region, etc.); invade; ravage: a time when looting hordes had overrun the province.
to swarm over in great numbers, as animals, especially vermin; infest: The house had been overrun by rats.
to spread or grow rapidly over, as plants, especially vines, weeds, etc.: a garden overrun with weeds.
to attack and defeat decisively, occupying and controlling the enemy's position; overwhelm.
to spread rapidly throughout, as a new idea or spirit: a rekindling of scholarship that had overrun Europe.
to run or go beyond, as a certain limit: The new jet overran the landing field.
to exceed, as a budget or estimate: to overrun one's allotted time.
to run over; overflow: During the flood season, the river overruns its banks for several miles.
to print additional copies of (a book, pamphlet, etc.) in excess of the original or the usual order.
to carry over (type or words) to another page.
to sail past (an intended stopping or turning point) by accident.
(of a ship) to complete (a schedule of calls) more rapidly than anticipated.
to outrun; overtake in running.
verb (used without object), overran, overrun, overrunning.
to run over; overflow: a stream that always overruns at springtime.
to exceed the proper, desired, or normal quantity, limit, order, etc.: Do you want to overrun on this next issue?
an act or instance of overrunning.
an amount in excess; surplus: an overrun of 10,000 copies of a new book.
the exceeding of estimated costs in design, development, and production, especially as estimated in a contract: a staggering overrun on the new fighter plane.
the amount exceeded: an overrun of $500,000 for each fighter plane.
a run on an item of manufacture beyond the quantity ordered by a customer and often offered at a discount.
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.

before 900; Middle English overrennen, Old English oferyrnan. See over-, run

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
vb , -runs, -running, -ran, -run
1.  (tr) to attack or invade and defeat conclusively
2.  (tr) to swarm or spread over rapidly
3.  to run over (something); overflow
4.  to extend or run beyond a limit
5.  (intr) (of an engine) to run with a closed throttle at a speed dictated by that of the vehicle it drives, as on a decline
6.  (tr)
 a.  to print (a book, journal, etc) in a greater quantity than ordered
 b.  to print additional copies of (a publication)
7.  (tr) printing to transfer (set type and other matter) from one column, line, or page, to another
8.  archaic (tr) to run faster than
9.  the act or an instance of overrunning
10.  the amount or extent of overrunning
11.  the number of copies of a publication in excess of the quantity ordered
12.  the cleared level area at the end of an airport runway

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. oferyrnan; see over + run.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

overrun definition

1. A frequent consequence of data arriving faster than it can be consumed, especially in serial line communications. For example, at 9600 baud there is almost exactly one character per millisecond, so if a silo can hold only two characters and the machine takes longer than 2 milliseconds to get to service the interrupt, at least one character will be lost.
2. Also applied to non-serial-I/O communications. "I forgot to pay my electric bill due to mail overrun." "Sorry, I got four phone calls in 3 minutes last night and lost your message to overrun." When thrashing at tasks, the next person to make a request might be told "Overrun!" Compare firehose syndrome.
3. More loosely, may refer to a buffer overflow not necessarily related to processing time (as in overrun screw).
[Jargon File]

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
But hopefully your university's not overrun by zombies.
Any workplace can become overrun by the gossip mill if the management structure in place allows for it.
By these means the poets, for many years past, were all overrun with pedantry.
Ticks gross me out and my field site is apparently overrun with them.
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