What exactly had she done?

[Deya]

ESL/EFL Test "Bones", question 10

Her children were very ungrateful for all she'd done for them as she had really worked her ......... to the bone for them.

(a) elbows
(b) arms
(c) legs
(d) fingers

ESL/EFL Test "Bones", answer 10

Her children were very ungrateful for all she'd done for them as she had really worked her fingers to the bone for them.

Correct answer: (d) fingers

Your answer was: incorrect
Her children were very ungrateful for all she'd done for them as she had really worked her arms to the bone for them.
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Hi,
I don't understand the sentense. What exactly had she done in other words?

Deya

[Alan]

Hi Deya,

The expression work your fingers to the bone means work very hard often by all the things you do to look after someone.

Alan
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English as a Second Language
You can read my ESL story Present Simple