man of straw  
noun [ C ] uk/ˌmæn əv ˈstrɔː/ us/ˌmæn əv ˈstrɑː/
  (WEAK)      
  UK生性懦弱的人 
someone who has a weak character
  He was accused by his opponents of being a man of straw and lacking in decisiveness. 对手骂他窝囊废,缺乏决断力。 
   (IMAGINARY)     
 稻草人(同 straw man)
a  straw man