不打不成相識

bu4 da3 bu4 cheng2 xiang1 shi2

don't fight, won't make friends (idiom); an exchange of blows may lead to friendship

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不打不成相識|不打不成相识 [bù dǎ bù chéng xiāng shí] ► don't fight, won't make friends (idiom); an exchange of blows may lead to friendship