verb (used with object), overpopulated, overpopulating.
to fill with an excessive number of people, straining available resources and facilities: Expanding industry has overpopulated the western suburbs.

1865–70; over- + populate

overpopulation, noun
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World English Dictionary
overpopulation (ˌəʊvəˌpɒpjʊˈleɪʃən)
the population of an area in too large numbers

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1798, from over + populate (q.v.). First attested in Malthus (in over-populousness).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
overpopulation   (ō'vər-pŏp'yə-lā'shən)  Pronunciation Key 
The population of an environment by a particular species in excess of the environment's carrying capacity. The effects of overpopulation can include the depletion of resources, environmental deterioration, and the prevalence of famine and disease.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Well, sure, you can use the overpopulation in some countries as a testing group.
The foundation plans to finance a sterilization program on the island to reduce
  the stray overpopulation.
Fertility drops, an important factor in countries where overpopulation leads to
  hunger and housing shortages.
Which means that the problem gets worse and not better as overpopulation
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