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to know what is what
01
to have a clear understanding or knowledge of a situation or matter
![to [know] what [is] what definition and meaning](https://cdn.langeek.co/photo/42314/original/?type=jpeg "to [know] what [is] what definition and meaning")
Idiom
Informal
Exemples
As an experienced chef, he knows what is what in the kitchen and can create amazing dishes from scratch.
She's been in the fashion industry for years and knows what is what when it comes to the latest trends.
