Sentence:  I made a speaking trumpet of my hands and commenced to whoop “Ahoy!” and “Hello!” at the top of my lungs. […] The Colonel woke up, and, after asking what in brimstone was the matter, <WSD>opened</WSD> his mouth and roared “Hi!” and “Hello!” like the bull of Bashan. 
Meaning of the word marked with <WSD> tags:  To make something accessible or allow for passage by moving from a shut position.