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

1.
自分のシャツさえも与える, 非常に寛大である
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.
彼はとても親切で、もし必要なら自分のシャツさえもくれるだろう。
•
My neighbor is the kind of person who would give you the shirt off their back.
私の隣人は、自分のシャツさえもくれるような人だ。