To eat humble pie. (See Humble Pie.)
To eat one out of house and home.
To eat so much that one will have to part with house and home in order to pay for it.
To eat one's words.
To retract in a humiliating manner; to unsay what you have said; to eat your own lick. To eat the mad cow.
A French phrase, implying that a person is reduced to the very last extremity, and is willing to eat even a cow that has died of madness; glad to eat cat's meat.
“Il mangea de cette chose inexprimable qu'on appelle de la vache enragée.” —Victor Hugo: Les Miserables.
To eat the leek. (See Leek.)
To eat well.
To have a good appetite. But “It eats well” means that what is eaten is agreeable or flavorous. To “eat badly” is to eat without appetite or too little; not pleasant to the taste.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894