to  know  one's stuff
know
nəʊ
new
<i>one's</i>
wʌnz
vanz
stuff
stʌf
staf

Определение и значение слова « know one's stuff» на английском языке

to know one's stuff
01

быть экспертом в чем-то

to be very knowledgeable about or skillful in a particular field of work 
to [know] {one's} stuff definition and meaning
идиома
неформальное
Примеры
You can tell the new mechanic really knows his stuff. 
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