to know what is what

अंग्रेज़ी में "know what is what"की परिभाषा और अर्थ

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
Idiom
Informal
उदाहरण
Having worked in IT for decades, he knows what is what in computer programming and can solve any technical issue.
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