the heavens open

US /ðə ˈhɛvənz ˈoʊpən/
UK /ðə ˈhɛvənz ˈoʊpən/
"the heavens open" picture
1.

天降大雨, 倾盆大雨

when it suddenly starts to rain very heavily

:
We were just about to start our picnic when suddenly the heavens opened.
我们正要开始野餐,突然天降大雨
I got completely soaked because the heavens opened just as I left the house.
我刚出门就下起了倾盆大雨,所以我全身湿透了。