What is another word for comes down buckets?
Pronunciation: [kˈʌmz dˌa͡ʊn bˈʌkɪts] (IPA) 
The phrase "comes down buckets" is a colloquialism that means it's raining heavily. Some synonyms for this phrase include "torrential rain," "heavy downpour," "deluge," "incessant rain," and "monsoon-like rain." Each of these terms describes a heavy rain that can cause floods and traffic disruptions, making it uncomfortable and dangerous to be outside. When it "comes down buckets," it's best to stay indoors and wait for the rain to stop. Nevertheless, it is a common phrase, usually evoking the sound and visual imagery that can describe a significant rainfall event and that we, as conversationalists or writers, commonly encounter from time to time.
