Related Clues:

• Toil
• Muscle woe
• Strain one's muscles
• Be cruel to
• Carry to excess
• Kind of wages
• Gild the lily
• Spartacus, for one
• Exert
• Put one's nose to the grindstone
• Fail at moderation
• Lay on too thick
• Stress
• Run through a sieve
• Go to an extreme