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.
Contemporary Examples

Israeli Court Rules Corrie Death Accidental Dan Ephron August 27, 2012
The New King of Congress Bryan Curtis November 27, 2010
Ariel Sharon’s Twilight Zone Lynn Sherr October 18, 2009
What Hawking and Jerusalem Day Have in Common Maysoon Zayid May 12, 2013
Smiling Under a Cloud of Tear Gas: Elif Shafak on Istanbul’s Streets Elif Shafak June 10, 2013

Historical Examples

Operation Terror William Fitzgerald Jenkins
The Sky Is Falling Lester del Rey
Operation Terror William Fitzgerald Jenkins
Birds Found on the Arctic Slope of Northern Alaska James W. Bee
Space Tug Murray Leinster

a powerful tractor fitted with caterpillar tracks and a blade at the front, used for moving earth, rocks, etc
(informal) a person who bulldozes

A person who bulldozes (1870s+)
A revolver (1880s+)

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