In the sentence, what does eat like a horse mean?
Despite the doctor’s advice, he still eats like a horse.
Note
eats a lot of food is correct because eat like a horse means to eat a very large amount of food.
This idiom or phrase is useful because it helps students understand the intended meaning beyond the individual words.
Examples: After soccer practice, the children ate like horses. My brother eats like a horse whenever he skips lunch.
The idiom compares a person's appetite to a horse's appetite; it does not describe speed or dislike of food.