Sentence:  It was Giselle , the fille de chambre , come to clean the room , and while she stood before him with ears pricked up and regard all curiosity , <WSD>explaining</WSD> her errand , Alex could see from the corner of his eye the doctor doing all he could to calm the displeased bird . 
Meaning of the word marked with <WSD> tags:  make plain and comprehensible