the shirt off someone's back
US /ðə ʃɜrt ɔf ˈsʌm.wʌnz bæk/
UK /ðə ʃɜrt ɔf ˈsʌm.wʌnz bæk/

1.
donner sa chemise, être extrêmement généreux
to be extremely generous, to give everything one has
:
•
He's so kind, he'd give you the shirt off his back if you needed it.
Il est si gentil, il te donnerait sa chemise si tu en avais besoin.
•
My neighbor is the kind of person who would give you the shirt off their back.
Mon voisin est le genre de personne qui te donnerait sa chemise.