Apparently Adele described this song in an interview as "burning the pain and getting rid of it and demolishing it...and its sort of like a liberating song because you know when you break up and the other person who you've left or who has left you knows how much you love them and they try and make your life hell and make it so that you can never get over them by constantly being in touch...its kind of like that and its about taking it into your own hands and just saying go away fuck off"
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