Related Clues:

• Words after keep or go
• Has one's nose to the grindstone, e.g.
• Hard at work
• Scuffling
• Take a crack __
• Doing the job
• "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