Foxes explained the song title to Artist Direct
: "I had this idea in my head about the 'Echo' of a relationship, and it stuck with me," she said. "I basically felt like the guy didn't really believe in the relationship enough. I felt like I was the only one making an effort. There's a line that says, 'Didn't you say you'd stay until we heard the last echo?' You'll stay until the 'Echo' is gone."
"It's almost like saying, 'Why wouldn't you stay until you heard the last pieces of our relationship?' It reminded me of an echo in that sense," Foxes added. "That's how the song came about."