it takes one to know one
it
ɪt
it
takes
teɪks
teiks
one
wʌn
van
to
know
nəʊ
new
one
wʌn
van

英語での「it takes one to know one」の定義と意味

it takes one to know one
01

used to suggest that in order to truly understand someone, one must possess similar qualities, experiences, or characteristics themselves 

ことわざ
The detective was able to identify the criminal's behavior because he himself had once been a criminal, proving how it takes one to know one. 
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