Definition of "roadblock" []

• A barricade or obstruction across a road set up to prevent the escape or passage, as of a fugitive or enemy troops. (noun)
• An obstruction in a road, as fallen rocks or trees. (noun)
• Something, such as a situation or condition, that prevents further progress toward an accomplishment. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Funnel enough money to Amtrak to repair the out-of-service cars (the main roadblock to increasing service right now)."
• "Perhaps a more legitimate roadblock is doubt about the effectiveness of the flu vaccine."
• "One potential roadblock is the amount of equity required to complete a deal, estimated at up to $4 billion, said the people familiar with the matter."