Meaning of the word "chucking it down" in English

What does "chucking it down" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

chucking it down

US /ˈtʃʌkɪŋ ɪt daʊn/
UK /ˈtʃʌkɪŋ ɪt daʊn/

Idiom

raining very heavily

Example:
It's absolutely chucking it down outside, so don't forget your umbrella.
We had to cancel the picnic because it started chucking it down.