bù不notzé择chooseshǒu手handduàn段method
To use any means to achieve one's goal; unscrupulous.
Literal meaning
not (不) — choose (择) — hand (手) — method (段)
Origin
A classical four-character phrase indicating a willingness to use any method, regardless of ethics, to achieve a goal.
Examples
Wèi为le了chéng成gōng功，tā他kě可yǐ以bù不zé择shǒu手duàn段。
He would use any means to succeed.
Wǒ我men们bù不néng能bù不zé择shǒu手duàn段de地zhuī追qiú求lì利yì益。
We cannot pursue profits unscrupulously.
Usage & nuances
Has a negative connotation, implying unethical behavior.
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