[n] vehicle equipped with heavy wide smooth rollers for compacting roads and pavements
[n] a massive inexorable force that seems to crush everything in its way
[v] overwhelm by using great force; "steamroller the opposition"
[v] crush with a steamroller as if to level; "steamroller the road"
[v] proceed with great force; "The new teacher tends to steamroller"
[v] bring to a specified state by overwhelming force or pressure; "The Senator steamrollered the bill to defeat"