Related Clues:

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