get blood from a stone
US /ɡɛt blʌd frəm ə stoʊn/
UK /ɡɛt blʌd frəm ə stoʊn/

1.
tirer du sang d'une pierre, essayer l'impossible
to try to obtain something that is very difficult or impossible to get, especially money or information from someone who is unwilling to give it
:
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Trying to make him pay back the loan is like trying to get blood from a stone.
Essayer de lui faire rembourser le prêt, c'est comme essayer de tirer du sang d'une pierre.
•
Getting any information from the uncooperative witness was like trying to get blood from a stone.
Obtenir des informations du témoin peu coopératif, c'était comme essayer de tirer du sang d'une pierre.