A dictionary of Confusable Phrases: More Than 10,000 Idioms and Collocations

eat like a pig • make a pig of oneself
eat like a pig —(also: eat like pigs) eat in a greedy or disgusting
manner: He has terrible table manners, he eats like a pig.
make a pig of oneself —(coll.) eat gluttonously; overindulge
in food (also: pig oneself ): I’m afraid I made a pig of myself at
dinner.
eat off something • eat out of something
eat off something —
1
. eat one’s food from a certain container:
Put vegetables on oven safe plate (you will be eating off this
plate) and put in toaster oven. 2. eat part of a piece of food:
“She always brought in a cake for him,” Foley said. “People
would eat off the cake for the rest of the day.”
eat out of something — = eat off something 
1
: Whenever he
eats lunch, he eats out of his own bowl and uses his own uten-
sils that he keeps for himself.
eat one’s head off • eat someone’s head off
eat one’s head off —
1
. said of an animal whose upkeep costs
more than it will sell for: That ox has been here all winter and
ate his head off. 2. (coll.) eat excessively or gluttonously: I am
not weighing in today as I just got back from New York and
ate my head off while I was there.
eat someone’s head off —(coll., also: bite someone’s head off )
speak to smb. in a rude and angry manner; severely criticize a
person: I have the worst temper in the world and will eat your
head off at the slightest thing.
earlier on
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eat one’s heart out • eat your heart out
eat one’s heart out—be unhappy and miserable, usually for
a long period of time: Raleigh, in prison, was eating his heart
out in the desire for freedom.
eat your heart out—(humorous) is used to say that one is even
better than the (famous) person mentioned: Choi Min-sik
gives what I think is the greatest performance ever, so eat your
heart out De Niro, Brando, and Pauly Shore.