Examples:

• He works his fingers to the bone to help his five children grow up in a healthy environment.
• She worked her fingers to the bone to provide a home and food for seven children.
• In those days we got up at 5 in the morning, and worked our fingers to the bone.
• His mother had had a hard life - had worked her fingers to the bone bringing up six children.
• I have washed, cooked, fetched and carried all my life. I worked my fingers to the bone in this house.