English version

what’s what

From Longman Dictionary of Contemporary Englishwhat’s whatwhat’s whatSITUATIONthe real facts about a situation that are important to know She’s been working here long enough to know what’s what. what
Examples from the Corpus
what’s whatI am a fly on the face of the Almighty, crawling over the surface to see what's what.He tells his mates what's what, and they laugh when he does.I keep my ears open and I know what's what around the office.So let's start by taking a look at what's what in floorcoverings.What's what in the psychic world?I like to think our academic standard's gone up, and we know what's what in the world.
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