"This all happens in the middle of winter." What's the meaning of "all" in this sentence?
The above is a part of a synopsis of "Fargo" movie. And I've heard a lot "it all happened...", "this all happened..."
And I've searched some dictionaries about "all". Then I guessed that in here "all" is "adverb" and means "completely" That's because its location is before verb in the sentence.
But I still cannot fully understand the above sentence meaning. Could you help me understand the meaning of "all" in here please?