pig       
noun [ C ] uk/pɪɡ/ us/pɪɡ/
  (ANIMAL)      
 A1 (US also hog)猪 
a large pink, brown, or black farm animal with short legs and a curved tail, kept for its meat
  The meat produced from a pig is called pork, bacon, or ham. 猪提供的肉类食品包括鲜猪肉、熏咸肉或火腿。 
 a pig farm 养猪场 
 - More examples
 - The main course of the feast was roast suckling pig.
 - Loud grunts were coming from the pig sty.
 - a pig pen
 - a dish of pigs' trotters
 - These pigs all have curly tails.
 
  (UNPLEASANT PERSON/THING)      
  informal令人讨厌的人,难相处的人 
a person who is unpleasant and difficult to deal with
  He was an absolute pig to her. 对她来说他讨厌至极。 
 He's a real pig of a man. 他这人真讨厌。 
 be a pig to do, play, etc. UK informal 做…/演奏…(等等)很难
to be very difficult or unpleasant to do, play, etc.
  It's a beautiful piece of music but it's a pig to play. 这支曲子很好听,但演奏起来难度很大。 
 The plane was a pig to fly.
 The software is really useful but it's a pig to set up.
 His house is in the middle of nowhere and it's a pig to get to.
 When you choose a high chair, remember that some of them are a pig to clean.
   (EATS TOO MUCH)      
  informal贪吃的人 
a person who eats too much
  You greedy pig! You're not having another biscuit! 你这个贪吃鬼,你不能再吃饼干了! 
   (POLICE)     
 offensive警官 
a police officer
 Idioms           
make a pig of yourselfidiom  disapproving 吃得过多
to eat too much
  They made complete pigs of themselves at the dinner. 他们在晚宴上大吃大喝。 
 make a pig's ear of somethingidiom UK informal 弄糟,搞砸
to do something badly, wrongly, or awkwardly
  He's made a real pig's ear of that bookcase he was supposed to be making. 他把该做的书架搞得不成样子了。 
 a pig in a pokeidiom  盲目购买(或接受)的东西
something that you buy or accept without first seeing it or finding out if it is good
 pigs might flyidiom UK humorous saying (US pigs can fly) 根本不可能的事情;无稽之谈
said when you think that there is no chance at all of something happening
  "I'll have finished it by tomorrow." "And pigs might fly!" “明天我就能完成了。”“那才怪呢。”