Sentence:  One day when he attended a war memorial ceremony in Westminster Abbey his view was obstructed by a stout man on his left , his attention turned to the irregular pattern of the rough slab flooring and someone , clasping him by the <WSD>arm</WSD> , whispered , `` I want a word with you , please '' . 
Meaning of the word marked with <WSD> tags:  a human limb; technically the part of the superior limb between the shoulder and the elbow but commonly used to refer to the whole superior limb