Related Clues:

• Drudgery
• Plug away
• Dull routine
• Slave away
• Elbow grease
• Rat race
• Work too hard
• Break one's back
• "Double, double --- and trouble..."
• Monotonous routine
• Wear down
• Travail
• Work like Tillie?
• Proceed laboriously
• Use a whetstone