Related Clues:

• Work like a slave
• Worry
• Exertion
• Hard work
• Sign of stress
• 'No ___!' ('Easy!')
• Elbow grease
• Worry, informally
• ___ it out
• Real effort
• ''Don't --- the small stuff!''
• Worry excessively
• 'Don't ___ it!'
• Word with shirt or shop
• It might be broken during aerobics