n.

1. 【鱼】鲨鱼[C]
   They were killed by a shark.

   他们被一条鲨鱼咬死。

n.[C]

1. 贪婪狡猾的人；放高利贷者；诈骗者
2. 【俚】能手，内行，专家
   a shark at bridge

   打桥牌的好手

vt.

1. 敲诈，诈取

vi.

1. 诈骗，行骗

n.

1. a long-bodied cartilaginous marine fish, typically predatory and voracious, with a prominent dorsal fin. [Many species in the subclass Elasmobranchii.]
2. a small black SE Asian freshwater fish. [Labeo bicolor and Morulius chrysophekadion.]
3. a light greyish-brown moth. [Cucullia umbratica.]

n.

1. a person who exploits or swindles others.
2. US an expert in a specified field:
   a pool shark.