[v. oh-ver-floh; n. oh-ver-floh]
verb (used without object), overflowed, overflown, overflowing.
to flow or run over, as rivers or water: After the thaw, the river overflows and causes great damage.
to have the contents flowing over or spilling, as an overfull container: Stop pouring or your glass is going to overflow.
to pass from one place or part to another as if flowing from an overfull space: The population overflowed into the adjoining territory.
to be filled or supplied with in great measure: a heart overflowing with gratitude; a region overflowing with orchards and vineyards.
verb (used with object), overflowed, overflown, overflowing.
to flow over; flood; inundate: The river overflowed several farms.
to flow over or beyond (the brim, banks, borders, etc.).
to cause to overflow.
to flow over the edge or brim of (a receptacle, container, etc.).
to fill to the point of running over.
an overflowing: the annual overflow of the Nile.
something that flows or runs over: to carry off the overflow from a fountain.
a portion crowded out of an overfilled place: to house the overflow of the museum's collection in another building.
an excess or superabundance: an overflow of applicants for the job.
an outlet or receptacle for excess liquid: The tank is equipped with an overflow.

before 900; Middle English overflowen, Old English oferflōwan. See over-, flow

overflowable, adjective
overflowingly, adverb
unoverflowing, adjective

13. overabundance, surplus, plethora, flood, glut.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
vb (usually foll by with) , obsolete -flows, -flowing, -flowed, -flown
1.  to flow or run over (a limit, brim, bank, etc)
2.  to fill or be filled beyond capacity so as to spill or run over
3.  to be filled with happiness, tears, etc
4.  (tr) to spread or cover over; flood or inundate
5.  overflowing matter, esp liquid
6.  any outlet that enables surplus liquid to be discharged or drained off, esp one just below the top of a tank or cistern
7.  the amount by which a limit, capacity, etc, is exceeded
8.  computing a condition that occurs when numeric operations produce results too large to store in the memory space assigned to it

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. oferfleow "to flow across, flood, inundate," also "to flow over (a brim or bank)," from ofer "over" + fleow "flow." The noun is attested from 1589.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

overflow definition

The condition that occurs when the result of a calculation is too big to store in the intended format. For example, the result of adding one to 255 cannot be represented as an unsigned, eight-bit integer. In a signed integer representation, overflow can occur when an integer becomes either too positive or too negative.
Overflow can also occur in the exponent of a floating point number representation. The term "underflow" is sometimes used for negative overflow of the exponent.
Ignoring overflow will result in nonsensicle results such as 255 + 1 = 0. At the hardware level, the ALU typically indicates overflow by setting an overflow flag bit which the program can test. Programming languages will typically respond to overflow by raising some kind of signal or other error condition to halt normal execution.
Some languages attempt to avoid overflow by providing (optional) variable length number representation (multiprecission arithmetic) so that the maximum number representable is limited only by the amount of storage available.
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
They all also have a watering tube as well as an overflow hole.
During heavy rain, it would overflow onto the road-we're talking about feet of
  water, not inches.
Consider connecting several rain barrels together for collection of overflow
  from the first main barrel.
Campus police officers directed them to an overflow room where they could watch
  the hearing on a video screen.
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