He backed down from his original position.

He is backing down from his original position.

I have been experiencing pain in my lower backs.

I have been experiencing pain in my low backs.

I have been experiencing pain in my low back for the past week.

The radio host is back announcing the songs played during the show.

He announced his decision to step back from the project.

The radio host back-announced the song title after it finished playing.

The radio station made several back announcements during the show.

The radio host is back-announcing the song that just played.