Oh girl, this boat is sinking
There's no sea left for me
And how the sky gets heavy
When you are underneath it

from Macklemore and Ryan Lewis (Ft. Fences) – Otherside (Ryan Lewis Remix) Lyrics on Rap Genius

Meaning

A reference to sinking into depression as a result of addiction.

There’s a play on words here. When you’re high (i.e., above “the sky”) you’re feeling good, but when you come off your high (“when you are underneath it”) you get depressed (“the sky gets heavy”).

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