what's what

[what's what] or [what is what] {n. phr.}, {informal}

1. What each thing is in a group; one thing from another.

* /The weeds and the flowers are coming up together, and we can't tell what is what./

2. All that needs to be known about something; the important facts or skills.

* /Richard did the wrong thing, because he is new here and doesn't yet know what's what./

* /When Bob started his new job, it took him several weeks to learn what was what./

* /When it comes to cooking, Jenny knows what's what./

* /Harold began to tell the teacher how to teach the class, and the teacher told him what was what./

Compare: WHICH IS WHICH, WHO'S WHO.

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Source: A Dictionary of American Idioms


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