What's what Meaning in English
expression
Definition
Used to describe the important facts or details about a situation, or to identify what is truly important or real. If you know what's what, you understand the true situation.
Usage & Nuances
Informal. Often used to say someone understands the real facts or has experience. Can be used for both knowledge of people or things. Usually in sentences like 'He knows what's what' or 'Let me show you what's what.' Not literal—refers to importance, not just identifying things.
Example Sentences
He really knows what's what in the company.
basic
After a week at school, I finally understood what's what.
basic
Let me show you what's what around here.
basic
If you want advice, talk to Sarah—she knows what's what.
natural
It took me a while to figure out what's what in that complicated system.
natural
New people often get confused until someone explains what's what to them.
natural