The Great Gatsby
The Great Gatsby, resolved itself
I'd like to know the meaning of "resolved itself into" in this excerpt from The Great Gatsby:
I became aware now of a hollow, wailing sound which issued incessantly from the garage, a sound which as we got out of the coupé and walked toward the door resolved itself into the words “Oh my God!” uttered over and over in a gasping moan.
Thank you.