know one's stuff
хорошо знать своё дело, хорошо ориентироваться
This woman knows her stuff and is a very skilled secretary.
Другие идиомы:
- know one's own mind
- know (something) by heart
- know (something) backwards and forwards
- know (something) in one's bones
- not know the first thing about something
- know when one is not wanted
- know where (someone) stands on (something)
- know the ropes
- know (something) only too well
- know (someone) by sight
- know a thing or two (about someone or something)
- know one's ABCs
- know a trick or two
- know which is which
- know-it-all