Ms

This song is describing a divorce, yes. Here is my interpretation, verse-by-verse.

We can’t lose touch but we can let go, blue and white gun made from Lego.

--> This first line is ambiguous. I think he means they can't lose touch because they are still going through the legal process. The reference to a blue and white Lego gun evokes wedding imagery--"something borrowed, something blue," and of course the white dress (and overall theme) of weddings. Why a Lego gun? Maybe just a beautiful image. They do this sometimes--having a symbol with no clear attachment. It is a poetic device to create an image in your eyes, something dreamlike. Which corresponds to the hallucinogenic quality of late-night breakup processing.

All the vowels vow to hold your name, keep your estate clean of me.

-->You will change your name and otherwise legally separate yourself from me.

I’ve pillowed you so many times this week, Close eyes, open, close again, forget and fall asleep. The dark seeks dark, The dark seeks dark, Darker, Darker,

-->This seems to reference how you would be in bed thinking about the person you are getting over, and it just keeps getting more and more bleak. Falling in and out of grief-crazed dreams, feeling no relief--in fact, feeling worse.

The nights of all my youth pressed into one glass of water.

-->The compacted nature of all that reflection you do when you are going through a loss, and suddenly alone. Sitting by yourself, drinking a glass of water, and thinking about your youth. About what happened. Where your life went. Maybe the sadness of that mixed with a loopy relief, because at least it is finally over, and you're reconnecting with who you were before a bad marriage took over your consciousness.

Scattered truths, bewildered beast boohoos, we have our weight: ten thousand ladybirds.

-->The weird, almost pathetic quality of crying alone over the breakup. The scattered truths you try to collect to make sense of it. Ten thousand ladybirds--another beautiful image. These are ladybugs in England. See that with the blue and white Legos, the glass of water. Alt-J is very film-oriented. Remember how ladybugs come into your house when it rains, which is a connection to lots of crying. Which would sound, you know. Hella cheesy if you put it that way. So they make it abstract, in order to make the melodrama palatable. (I borrowed that idea from the film critic Zizek.)

All the vowels vow to guard your name, keep your estate clean, happy. Some things lie too deep for tears to well, Close eyes open, close again, feel as my body spells Dark seeks dark, Dark seeks dark, Darker, Darker, The shadow burns across like embers tide paper. Darker, darker, darker, darker.

-->The grief can't get to the bottom of how the breakup has broken him. The tears won't offer catharsis, at least not in any resolved sense. He is just stuck tunneling further downward into the dark. "The shadow burns across like embers tide paper" -- could bring to mind a burning piece of paper. A wedding certificate maybe. Because if you burned a piece of paper in your hand, the ash would burn horizontally--across. The burn marks flickering up and down like a tide of embers across a piece of paper.