pig

pig [countable]

1

animal

 a farm animal with short legs, a fat body, and a curved tail. Pigs are kept for their meat, which includes pork, bacon and ham [= hogAmerican English]

He kept pigs and poultry.

2

person

spoken

a) someone who eats too much or eats more than their share:

You greedy pig, you ate all the candy!

I made a bit of a pig of myself (=ate too much) at dinner.

b) someone who is unpleasant in some way, for example unkind or very untidy:

They live like pigs in that house over the road.

You can tell him from me he's an ignorant pig.

(male) chauvinist pig (=a man who thinks women are not equal to men)

3

police

taboo informal an offensive word for a police officer. Do not use this word.

4

a pig (of a something)

British English spoken something that is very difficult or unpleasant to do:

They're improving, and they're a pig of a team to beat.

5

make a pig's ear of something

British English spoken to do something very badly:

Someone's made a right pig's ear of these repairs.

6

in a pig's eye

American English spoken informal used to show that you do not believe what someone is saying

7

pig in a poke

spoken something you bought without seeing it first and that is not as good or valuable as you expected:

What if the car you buy turns out to be a pig in a poke?

8

pigs might fly

spoken used to say that you do not think something will happen:

'Someone might have handed in your pass.' 'Yes, and pigs might fly.'

Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.