know what's what
знать что к чему, быть осведомлённым
I am sure Jim knows what's what about a lot of things.
Другие идиомы:
- know which is which
- know (something) backwards and forwards
- know a trick or two
- know (something) only too well
- not know the first thing about something
- know better (than to do something)
- know (something) inside out
- know the ropes
- know one's ABCs
- know (someone or something) like the back of one's hand
- know one's stuff
- know the score
- know a thing or two (about someone or something)
- know one's own mind
- know (something) in one's bones