Meaning of the word "write something down" in English

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

write something down

US /raɪt ˈsʌmθɪŋ daʊn/
UK /raɪt ˈsʌmθɪŋ daʊn/

Phrasal Verb

to record something in writing

Example:
Please write something down so you don't forget it.
I need to write something down before I lose the idea.