know one's ABCs
знать основное о чём-либо, иметь базовые знания
The woman in the library knew her ABC's and could quickly give me the information I needed.
Другие идиомы:
- know when one is not wanted
- know better (than to do something)
- know (something) only too well
- know (something) backwards and forwards
- know (someone or something) like the back of one's hand
- know all the tricks of the trade
- know (something) from memory
- know which is which
- not know if one is coming or going
- know the ropes
- know which side one's bread is buttered on
- know where all the bodies are buried
- know (something) by heart
- know one's place
- know (something) in one's bones