What is the meaning of steamroller?

noun

• A massive inexorable force that seems to crush everything in its way.
  • synonyms: juggernaut
• Vehicle equipped with heavy wide smooth rollers for compacting roads and pavements.
  • synonyms: road roller

verb

• Bring to a specified state by overwhelming force or pressure.
  • usage: "The Senator steamrollered the bill to defeat"
  • synonyms: steamroll
• Proceed with great force.
  • usage: "The new teacher tends to steamroller"
  • synonyms: steamroll
• Crush with a steamroller as if to level.
  • usage: "steamroller the road"
• Overwhelm by using great force.
  • usage: "steamroller the opposition"
  • synonyms: steamroll
• Make level or flat with a steamroller.
  • usage: "steamroll the roads"
  • synonyms: steamroll