know what's what
знать что к чему, быть осведомлённым
Пример использования идиомы know what's what:
I am sure Jim knows what's what about a lot of things.
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Другие идиомы:
- know (something) inside out
- know where (someone) stands on (something)
- know where all the bodies are buried
- know a trick or two
- know which is which
- know (something) backwards and forwards
- know one's place
- not know the first thing about something
- know (something) by heart
- know all the tricks of the trade
- not know if one is coming or going
- know (something) in one's bones
- know one's own mind
- know when one is not wanted
- know better (than to do something)