steamroller

noun

1. a heavy, originally steam-driven, machine with rollers, used in building and repairing roads
2. an overwhelming power or influence, esp. when used relentlessly to force acceptance of a policy, override opposition, etc.

transitive verb

1. to bring overwhelming force to bear upon; crush or override as if with a steamroller
2. to cause the passage or defeat of (a legislative bill, etc.), or make (one's way, etc.), by crushing opposition or overriding obstacles

intransitive verb

adjective