1. a long line of vehicles moving slowly or stopped on a road
Usage: British
2. a football player positioned behind the quarterback who carries the ball
Usage: American football

Examples

• The accident caused a five-mile tailback on the motorway.
• Traffic was at a standstill due to the tailback near the construction zone.
• The tailback rushed for over 100 yards in the game.
• He played tailback for his high school football team.
• Drivers were advised to avoid the area because of the tailback.
• The coach called a play for the tailback to run up the middle.