the heavens open
US /ðə ˈhɛvənz ˈoʊpən/
UK /ðə ˈhɛvənz ˈoʊpən/
1.
when it suddenly starts to rain very heavily
:
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We were just about to start our picnic when suddenly the heavens opened.
•
I got completely soaked because the heavens opened just as I left the house.