lion          
noun [ C ] uk/ˈlaɪ.ən/ us/ˈlaɪ.ən/
A2 (female lioness)狮,狮子 
a large wild animal of the cat family with yellowish-brown fur that lives in Africa and southern Asia
  a pride (= group) of lions 狮群 
  大师,巨匠;高人
someone who is important, successful, or powerful
  a literary lion 文学大师 
 - More examples
 - The lion loped across the grass.
 - The lion is a member of the cat family.
 - The girl stood gazing in pity at the old lion in the cage.
 - He wrestled the lion to the ground with his bare hands.
 - The lion slowly reared its head and looked around.
 
Idioms     
the lion's denidiom  虎穴,狼窝;危险境地
a dangerous or threatening place or situation
 the lion's shareidiom  最大份额,大部分
the largest part or most of something
  Reputable charities spend the lion's share of donations on aid and a tiny fraction on administration. 声誉好的慈善机构将捐款的大部分都花在援助上,只有极少部分用于管理。