Meaning of "all-you-can-eat buffet"

[Vista]

English Language Tests, Intermediate level

ESL/EFL Test #342 "English Slang Idioms (63)", question 2

I am never going to take Grace to an all-you-can-eat buffet again. She ate like a .........-- she only had one plate of food!

(a) pig
(b) chicken
(c) bird
(d) mouse

English Language Tests, Intermediate level

ESL/EFL Test #342 "English Slang Idioms (63)", answer 2

I am never going to take Grace to an all-you-can-eat buffet again. She ate like a bird-- she only had one plate of food!

Correct answer: (c) bird
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IN IDIOMATIC EXPRESSIONS, WHAT DOES TO EAT ONCE WORD MEANS?

Vista

[Mister Micawber]

to eat one's words = to retract one's statement, esp. with humility: 'They predicted his failure, but he made them eat their words'.
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Native English teacher at Mister Micawber's