bulldozer

Short definition from Wiktionary

Noun

1. 1
   A tractor with caterpillar tracks and an attached blade for pushing earth and building debris for coarse preliminary surface grading, demolishing building structures, etc.
2. 2
   One who bulldozes.
3. 3
   A member of a self-identified group of white US Southerners who colluded to influence outcomes of post-Reconstruction elections by intimidating, coercing and bullying black voters and legislators, including burning down houses and churches, flogging and murdering opponents.
4. 4
   A bully; an overbearing individual.

Verb

1. 1
   To bulldoze (demolish with a bulldozer).
2. 2
   To bulldoze (push through forcefully).