{adv. phr.}, {informal} At a low price; for a bargain price; cheaply. * /He sold the invention for a song and its buyers were the ones who got rich./ * /They bought the house for a song and sold it a few years later at a good profit./
FOR A SONG
Meaning of FOR A SONG in English
Dictionary of English idioms . Словарь английских идиом. 2012