Meaning of the word "who knows" in English

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

who knows

US /huː noʊz/
UK /huː nəʊz/

Phrase

used to say that you do not know something and that you think no one else does either

Example:
Who knows what will happen tomorrow?
Maybe he'll come, maybe not. Who knows?