Sentence:  In 2002, American interrogators on the ground in Afghanistan developed a technique they called “<WSD>monstering</WSD>.” The commander “instituted a new rule that a prisoner could be kept awake and in the booth for as long as an interrogator could last.” One “<WSD>monstering</WSD>” interrogator engaged in this for thirty hours.177 
Meaning of the word marked with <WSD> tags:  To behave as a monster to; to terrorise.