You held me down, but I got up (hey)
Already brushing off the dust

from Katy Perry – Roar Lyrics on Rap Genius

Meaning

Katy’s greatest enemies (the boyfriend and the musical obstacles), pinned her to the ground, preventing her from reaching her highest potential. Except it didn’t last… because what doesn’t kill her only made her stronger.

The “dust” that Katy is referring to is her previous, weaker self. She has become a stronger woman, and does not let silly things drag her down anymore.

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