groper  
noun [ C ] uk/ˈɡrəʊ.pər/ us/ˈɡroʊ.pɚ/
  (PERSON)      
  informal性骚扰者 
someone who touches another person's body in order to get sexual pleasure, when that person does not want them to
  gropers on crowded trains 拥挤的火车上的性骚扰者 
   (FISH)     
 Australian English(同 grouper) 
a  grouper