Related Clues:

• Barrel staves
• Trails the pack
• Delays
• Slips behind
• Isn't timely
• Doesn't keep pace
• Tarries
• Fails to keep pace
• Isn't first
• Fades to the back of the pack
• Falls (behind)
• Is a straggler
• Problems in synchronization
• Drops back
• Fails to keep up