a large, powerful tractor having a vertical blade at the front end for moving earth, tree stumps, rocks, etc.
a person who intimidates or coerces.

1875–80, Americanism; 1925–30 for def 1; bulldoze + -er1

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World English Dictionary
bulldozer (ˈbʊlˌdəʊzə)
1.  a powerful tractor fitted with caterpillar tracks and a blade at the front, used for moving earth, rocks, etc
2.  informal a person who bulldozes

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

"person who intimidates by violence," 1876, from bulldoze (q.v.). Meaning extended to ground-clearing caterpillar tractor in 1930.
Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Britannica


powerful machine for pushing earth or rocks, used in road building, farming, construction, and wrecking; it consists of a heavy, broad steel blade or plate mounted on the front of a tractor. Sometimes it uses a four-wheel-drive tractor, but usually a track or crawler type, mounted on continuous metal treads, is employed. The blade may be lifted and forced down by hydraulic rams. For digging, the blade is held below surface level; for transporting, it is held at the surface level; and for spreading, it is held above the surface level, as the tractor moves forward

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
While pounding the rebels in the hillside with rockets, they brought in a
  bulldozer to clear the first barricade.
The only noise comes from a bulldozer smoothing the coal-mound and the cawing
  of rooks.
Install a phone and some sensors inside a bulldozer, and it can call a mechanic
  before it goes wrong.
Amazing video of brand new suburban homes being razed by bulldozer.
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