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 <WSD>let</WSD> out a low-pitched , wobbling sound like a muffler blowing out . 
Meaning of the word marked with <WSD> tags:  make known to the public information that was previously known only to a few people or that was meant to be kept a secret