heap coals of fire on smb.'s head

   oтплaтить дoбpoм зa злo, oбeзopужить кoгo-л. вeликoдушиeм [этим. библ.]

    Oh! Mamma, you're too kind to me! I don't deserve it. It's like heaping coals of fire on my head after the way I've gone on (A. J. Cronin). Even the Dean, convinced that he was heaping coals of fire on the Master's head, consented to discuss the need for conservatism in the intellectual climate of the present day (Th. Sharpe)