Meaning of the word "what was that" in English

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

what was that

US /wʌt wʌz ðæt/
UK /wɒt wɒz ðæt/

Phrase

used to ask for clarification or repetition of something just said or heard, often implying surprise or disbelief

Example:
You're moving to Alaska? What was that?
I just heard a strange noise. What was that?