Etymology
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bulldozer (n.)

"person who intimidates others by threats or violence," 1876, agent noun from bulldoze (q.v.). Meaning extended to "an engine-powered ground-clearing caterpillar tractor" in 1930.

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Definitions of bulldozer

bulldozer (n.)
large powerful tractor; a large blade in front flattens areas of ground;
Synonyms: dozer
From wordnet.princeton.edu