The term 'end-of-song feature' refers to a technique used in music production, specifically the process of fading out a song at the end. This is often done by gradually reducing the volume of the track until it is completely silent. The crossword solution for this term is 'FADE, ' which is a common term used to describe this technique. Fading out a song is a popular way to end a track and can be used to create a smooth transition between songs.