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Bulldozer

Posted by Bruce Kahl on April 30, 2004

"A heavy, driver-operated machine for clearing and grading land, usually having continuous treads and a broad hydraulic blade in front. 2. An overbearing person; a bully"

OK...but does anyone know the history of this word?
Is/was this a brand name?
German? Slavic? Norse?

Doze is to sleep/nap.
Anybody?