Pronunciation: (rōd'blok"), [key]
1. an obstruction placed across a road, esp. of barricades or police cars, for halting or hindering traffic, as to facilitate the capture of a pursued car or inspection for safety violations.
2. an obstruction on a road, as a fallen tree or a pile of fallen rocks.
3. a hastily built barricade, as of barbed wire, erected across a road to hold up the advance of an enemy.
4. an action, condition, etc., that obstructs progress toward an objective: Nationalism is a roadblock to European unity.
to halt or obstruct with or as if with a roadblock.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.