The star said she was inspired by the feeling of being in love for the first time when writing her new album Ceremonials.
She said to NME magazine: 'I was obsessed with drowning. It's about succumbing and being completely overwhelmed by something that's bigger than everything.
'I think it comes from being in love for the first time. Like totally and utterly in love. Like first, 17-year-old love. I remember falling in love with this boy and having the first glimpse he might like me too.'
She added that the track, What the Water Gave Me, is about Virginia Woolf's suicide, when she walked into a river with stones in her pockets.
She said: 'It's so powerful, that thing of weighing yourself down with stones. It's idyllic in one way and horrifying in another.'