Related Clues:

• Plug away
• Slave away
• Elbow grease
• Work too hard
• Break one's back
• "Double, double --- and trouble..."
• Travail
• Work like Tillie?
• Proceed laboriously
• Hard labor
• Put one's nose to the grindstone
• ''. . . ___ and trouble'' (''Macbeth'')
• Pains
• "Bubble, bubble, __ and trouble ..."
• Work wearyingly