A: Have you got the money needed for your startup?

B: Yes, finally. My parents and some old classmates helped me out. Tammy was a great help.

A: I’m not surprised that Tammy loaned you money — she would give a friend the shirt off her back.

Note: This idiom means “to act in a very generous and selfless manner.” This hyperbole appeared in Tobias Smollett’s 1771 novel “Humphry Clinker,” and has been used ever since.