Definition of the shirt off (or on) one's back in English:

the shirt off (or on) one's back

phrase

informal
  • Used to refer to someone's last remaining possessions.

    ‘he had fled to France with nothing but the shirt on his back’
    • ‘And Afghans themselves are very generous hosts; they would give you the shirt off their back if they felt you needed it.’
    • ‘He learned that if he took the shirt off your back and showed you the blood of children in the fabric, people would snap alert.’
    • ‘‘He was the best… he would give you his heart and soul, he'd give you the shirt off his back or a coat to a stranger,’ said his father Eamonn yesterday with a justifiable pride in his voice.’
    • ‘He's a guy who would literally give you the shirt off his back and he has two beautiful children.’
    • ‘He'd give you anything, including the shirt off his back, if you asked him.’
    • ‘About what a good person he is to have as a friend, and how he would give anyone, even his worst enemy, the shirt off his back.’
    • ‘They've treated everybody fairly, and they will give you the shirt off their back.’
    • ‘He was a tough ole cowboy who would give you the shirt off his back.’
    • ‘A Scorpio will gladly give you the shirt off their back if you need it, but you may get the slightest inkling that they have an ulterior motive for doing so.’
    • ‘He'd give anyone the shirt off his back if he thought they needed it.’