Meaning of the word "one by one" in English

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

one by one

US /wʌn baɪ wʌn/
UK /wʌn baɪ wʌn/

Phrase

one at a time; individually

Example:
The children came into the room one by one.
He addressed each of their concerns one by one.