Related Clues:

• Exchanging words
• Keep __ (persevere)
• Words after hard or keep
• Steadily working
• Getting the job done
• In the act
• Working busily
• Busting one's hump
• Engaged in a 38-Down
• Attacking the job
• Have ___
• Going full tilt
• Vexatious
• 'While you're ___ ...'
• Trying hard