know your stuff
US /noʊ jʊər stʌf/
UK /noʊ jʊər stʌf/
1.
menguasai bidangnya, sangat ahli
to be very knowledgeable and skilled in a particular area or subject
:
•
You can trust her advice; she really knows her stuff when it comes to financial planning.
Anda bisa mempercayai sarannya; dia benar-benar menguasai bidangnya dalam hal perencanaan keuangan.
•
The new mechanic clearly knows his stuff; he fixed the engine in no time.
Mekanik baru itu jelas menguasai bidangnya; dia memperbaiki mesin dalam waktu singkat.