In this case it's clearly a hyperbola, and the intended meaning is as you say. But it is possible to work one's fingers sore, and it can be used literal.
1 december 2015
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Thanks. So does it mean that one will go to great length to get something done but not literally getty hurt?
1 december 2015
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Heb je je antwoorden nog steeds niet gevonden?
Schrijf je vragen op en laat de moedertaalsprekers je helpen!