give the shirt off one's back
Give anything and everything one possesses. For example, Tom is truly generous—he'll give you the shirt off his back. This hyperbolic idiom was first recorded in 1771.
Words nearby give the shirt off one's back
give the devil his due,
give the eye,
give the finger,
give the go-ahead,
give the lie to,
give the shirt off one's back,
give the slip,
give the time of day,
give the word,
give the works,
give to understand