Sentence:  “Why bother with the daily grind when you can go to Mosul, get paid $400 a month, get a wife – and live an Islamic way,” went an <WSD>exchange</WSD> between two men overheard by a fellow passenger in a taxi. Rumour has it that a woman whose husband died fighting with Isis now receives a generous widow's pension from jihadi coffers. 
Meaning of the word marked with <WSD> tags:  A conversation.