What the part of speech of the word "open" in the next sentence:
He had only time to back away before the thick wooden doors swung open, hinges protesting loudly.
What the meaning of the second part of the sentence "hindges protesting loudly"?
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The second part of the sentence, "hinges protesting loudly," is figurative.
The author is personifying the hinges in order to draw a connection between the sound the hinges are making and the sound that people make while protesting. Suspense is built in this way (by using a combination of lengthy syntax and powerful imagery).
Basically, it is just a fancy way of saying the door's hinges were creaking loudly.