What are the difference between:
I drank my liquor when I ate my meal.
I drank my liquor when I was eating my meal.
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The word when as a conjunction is used to mean at or during the time something happens or after/as soon as something happens.
Taking these senses into consideration, I think that there's a difference in meaning between these sentences.
The sentence #1 is a bit ambiguous in its meaning. It may mean the same thing as the sentence #2, that is, I drank my liquor at or during the time I ate/was eating my meal, and it may also mean that I drank my liquor after/as soon as I ate my meal.
On the other hand, the sentence #2 has a clear meaning; the action of drinking took place during the time I was eating my meal.