Sentence:  She stood up , pulled the coat from her shoulders and started to slide it off , then let out a high-pitched scream and I let out a low-pitched , wobbling <WSD>sound</WSD> like a muffler blowing out . 
Meaning of the word marked with <WSD> tags:  (phonetics) an individual sound unit of speech without concern as to whether or not it is a phoneme of some language