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

Definição e significado de "know one's stuff"em inglês

to know one's stuff
01

to be very knowledgeable about or skillful in a particular field of work 

to [know] {one's} stuff definition and meaning
expressão idiomática
informal
Exemplos
You can tell the new mechanic really knows his stuff. 
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