Question

May I take your order?
- Yes, please. I'll have a steak sandwich, one fruit salad, and a milk.
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What does 'a milk' mean in the last sentence? A glass of milk?

Answer 1

Yes, but "a milk" isn't correct(although lots of people make the error. Milk is a non-count noun, so "a" is incorrect with it. It's correct to say "a glass of milk" or "a carton of milk" or another expression that's similar.