Bucket down British informal
To rain heavily and at great length
Where are you going to go? It's bucketing down out there.
The weather forecast says tomorrow it will bucket down, so we may have to cancel our picnic.
Rainy, wet weather
If the heavens open, it starts to rain heavily.
Used to mean that it is the high humidity that makes a person uncomfortable rather than the degree of heat
Intensely hot and irritated
A heavy rain
The verb "bucket" should be conjugated according to its tense.