eat like a horse

Meaning: 大食いである、馬食する

For Example:

‣ Even though she eats like a horse, she doesn't seem to gain any weight.

彼女はとても大食いだが、全く太る気配がない。

‣ Please stop eating like a horse at a restaurant. That's not really lady-like.

レストランで馬食するのはやめまい。レディーのすることやない。

Synonym:

to gorge

to eat heavily