Related Clues:

• Concept in fluid dynamics
• [Bo-o-o-oring!]
• Wagon wheel track
• Force inhibiting progress
• What grading will get rid of
• Noisome noise
• Sleep loudly
• Critic's word for a boring show
• Snoozefest
• Mind-numbing routine
• Aerodynamics challenge
• Cart track, e.g.
• Wearisome routine
• Boring daily routine
• Dozer's din