In the song Thank You, Dido sings:
My tea's gone cold I'm wondering why I
got out of bed at all.
The morning rain clouds up my window,
and I can't see at all.
And even if I could, it would all be gray,
but your picture on my wall.
It reminds me that it's not so bad.
It's not so bad.
I'm interested in the grammatical function of rain, clouds, and up.
Is clouds up the (phrasal) verb and rain the subject, or is rain clouds a compound noun and up a preposition?
A) What is it? It's the morning rain. What does it do? It clouds up my window. The morning rain clouds up my window.
B) What is it? It's the morning rain clouds. Where are they? They are up my window. The morning rain clouds up my window.
What do you think?