gym shoe          
noun [ C ] uk/ˈdʒɪm ˌʃuː/ us/ˈdʒɪm ˌʃuː/
 UK old-fashioned(尤指用于室内体育活动、平胶底的)运动鞋 
a flat shoe with a rubber sole, worn for sports, especially indoor sports 
 Synonym: plimsoll
  US old-fashioned(用于体育或非正式场合、轻巧舒适的)健身鞋 
a light, comfortable shoe that is suitable for sports or informal wear 
 Synonym: sneaker