beast          
noun [ C ] uk/biːst/ us/biːst/
 formal(尤指大型或野生的)动物;野兽 
an animal, especially a large or wild one
  a wild beast 野兽 
 The room wasn't fit for man or beast. 这个房间根本没法住。 
  old-fashioned粗暴(或卑劣、凶残)的人 
an unpleasant, annoying, or cruel person
  He was a beast to her throughout their marriage. 结婚后,他一直对她很粗暴。 
 Idiom  
beast of burdenidiom  literary 役畜(如驴、牛等)
an animal such as a donkey or an ox that is used to carry or pull things