Sentence:  Jubal 's <WSD>conversations</WSD> coming and going - Jubal 's words troubled him most ; he studied them , compared them with what he had been taught as a nestling , struggling to bridge between languages , the one he thought with and the one he was learning to think in . 
Meaning of the word marked with <WSD> tags:  the use of speech for informal exchange of views or ideas or information etc.