know one's stuff
хорошо знать своё дело, хорошо ориентироваться
This woman knows her stuff and is a very skilled secretary.
Другие идиомы:
- know (something) from memory
- know (someone) by sight
- know-how
- know when one is not wanted
- know one's ABCs
- not know if one is coming or going
- know one's own mind
- know better (than to do something)
- know which side one's bread is buttered on
- know which is which
- know the ropes
- know (something) in one's bones
- know what's what
- know where all the bodies are buried
- know the score