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

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