a growth overspreading or covering something.
excessive growth: to prune a young tree so as to prevent overgrowth.

1595–1605; over- + growth

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World English Dictionary
overgrow (ˌəʊvəˈɡrəʊ)
vb , -grows, -growing, -grew, -grown
1.  (tr) to grow over or across (an area, path, lawn, etc)
2.  (tr) to choke or supplant by a stronger growth
3.  (tr) to grow too large for
4.  (intr) to grow beyond normal size

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
We have the benefit of cover, lush overgrowth and ancient ruins.
Cities can develop in ways that prevent overgrowth and crowding.
Farmers were clearing their land of brush and overgrowth, so there were a lot
  of fires in the area.
Many of our problems are linked to overgrowth of human population.
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