Related Clues:

• Sound from a boxer
• Canine warning
• Bottleneck
• Hair problem
• Traffic congestion
• Watchdog's greeting
• Bump on a log
• Terrier's audible warning
• Tangle a thread
• Ursine sound
• Knot in a tree
• Spike's greeting
• Twist out of shape
• Lock problem?
• Freeway trouble