1pig 
/ˈpɪg/ noun
plural pigs /ˈpɪg/ noun 1 [count] : an animal that has a fat body with short legs, a small tail, and a wide nose and that is raised on a farm or lives in the wild — compare hog, piglet, sow; see also guinea pig, potbellied pig 2 [count] informal + disapproving a : someone who eats a lot of food especially at one time
▪ The kids eat like pigs. [=the kids eat a lot] ▪ I made a pig of myself at dinner. [=I ate too much at dinner]
b : someone who selfishly wants or takes more than other people
▪ a greedy pig
c : someone who is unpleasant or offensive
▪ Don't be a pig. Say “excuse me” after you burp. ▪ They live like pigs. [=they live in a dirty environment] ▪ He is a sexist pig. = He is a male chauvinist pig. [=he is a man who thinks women are not equal to men] 3 [count] slang, offensive : police officer 4 [singular] Brit, informal : something that is very difficult or unpleasant — + of ▪ I had a pig of a day at work. [=I had a very difficult day at work]
▪ The kids eat like pigs. [=the kids eat a lot] ▪ I made a pig of myself at dinner. [=I ate too much at dinner]
b : someone who selfishly wants or takes more than other people
▪ a greedy pig
c : someone who is unpleasant or offensive
▪ Don't be a pig. Say “excuse me” after you burp. ▪ They live like pigs. [=they live in a dirty environment] ▪ He is a sexist pig. = He is a male chauvinist pig. [=he is a man who thinks women are not equal to men]
a pig in a poke
old-fashioned : something usually of poor quality that someone tries to persuade you to buy or accept when you do not know much about it
▪ If you buy a used car without testing it, you're buying a pig in a poke.
▪ If you buy a used car without testing it, you're buying a pig in a poke.
in a pig's eye — see 1eye
make a pig's ear (out) of
Brit, informal : to do or manage something badly
▪ He has made a pig's ear of his reelection campaign.
▪ He has made a pig's ear of his reelection campaign.
pig in the middle — see 1piggy
pigs might fly
Brit, informal — said as a response to something that seems unlikely to happen ▪ “This time I think he'll ask me to marry him!” “Yeah, and pigs might fly.”
when pigs fly
US, informal — used to say that you think that something will never happen ▪ The train station will be renovated when pigs fly. [=it will never be renovated]
