Sentence:  The soldier now blew upon a green whistle, and at once a young girl, dressed in a pretty green silk gown, entered the room. She had lovely green hair and green eyes, and she <WSD>bowed</WSD> low before Dorothy as she said, "Follow me and I will show you your room." 
Meaning of the word marked with <WSD> tags:  To bend oneself as a gesture of respect or deference.