it's chucking it down

be chucking (it) down

To be raining very heavily. Primarily heard in UK. We have a football match scheduled for tomorrow, but if it's chucking down like it is today, I'm sure that it will be postponed. Looks like it's chucking it down outside again. I guess I won't be cycling to work this morning.
See also: chuck, down
Farlex Dictionary of Idioms.

it’s ˈchucking it down

(British English, spoken) it is raining heavily: They had to cancel the barbecue, as it started chucking it down.
See also: chuck, down
Farlex Partner Idioms Dictionary
See also:
  • be chucking (it) down
  • be tipping (it) down
  • it's tipping down
  • tipping (it) down
  • rain stair-rods
  • pitchfork
  • It's raining pitchforks
  • it's raining pitchforks (and hammer handles)
  • it's raining cats and dogs
  • raining cats and dogs, it's
References in periodicals archive
IT'S chucking it down on the eight celebs in Costa Rica.
IT'S chucking it down on [...]
She said: "'When it's dark and the road is unlit, you've only got the name of a house and no number, your torch goes out and it's chucking it down with rain, then it's not glamorous."
Gran is voted UK's top private eye