Related Clues:

• Worked too hard
• Struggled
• Plugged away
• Put one's nose to the grindstone
• Worked hard
• Toiled away
• Moved heaven and earth
• Worked a 12-hour shift, e.g.
• Tried mightily
• Slogged away
• Applied elbow grease
• Worked up a sweat
• Worked way too hard
• Worked arduously
• Worked long and hard