Lyric discussion by jojoinpink54 

"I'd sink us to swim"

I think this means that he would rather, for the sake of "marching on", force himself down to the bottom if that's what will let him move forward, instead of being stuck in the same place, "floating" if you will. I think it's a really amazing lyric, it's great when artists can say so many things with a couple words and convey emotions through simplicity.

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