Related Clues:

• "He's ___ again!"
• Fully engaged
• Going __: squabbling
• Exchanging words
• Keep __ (persevere)
• Words after hard or keep
• Steadily working
• Getting the job done
• In the act
• Working busily
• Busting one's hump
• Unlike doves
• Engaged in a 38-Down
• Attacking the job
• Have ___