Gary : You look like a drowned rat! Didn’t you watch the weather forecast this morning?
Adam : I knew it would be a shower but I didn’t know it would rain cats and dogs today.
What does Adam mean by saying “I didn’t know it would rain cats and dogs today.”?
I didn't know it would rain all day.
I didn't know it would rain so hard today.
I didn't know it would be a thunderstorm today.
I didn't know it would be a drowning rain today.