Related Clues:

• "They're ___ again"
• Having a row
• Engaged in an activity
• Down to business
• 'Keep ___!' ('Don't quit!')
• Bickering, say
• Going ___ (battling)
• Having a scrap
• Keep ___ (continue)
• Arguing vehemently
• Angled, no line is doing that
• Working on the task
• A singer performing
• Keep __: persevere
• Working tirelessly