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) by heart
- know (someone) by sight
- know (something) only too well
- know which side one's bread is buttered on
- know one's ABCs
- know a thing or two (about someone or something)
- know one's own mind
- know the ropes
- know better (than to do something)
- know one's stuff
- not know if one is coming or going
- not know the first thing about something
- know (something) in one's bones
- know-how
- know when one is not wanted