...know which side your bread is buttered;to know which side your bread is buttered on：知道自己的利益所在；善于为自己打算 to take the bread out of sb's mouth：剥夺某人的谋生手段；断某人的生计 ..
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善于为自己打算
Be good at planning for yourself
以上为机器翻译结果，长、整句建议使用 人工翻译 。
而且在智力方面，法律方面，真有一套，再加上他那种精明、善于为自己打算、真活象一只山猫或是一只雪貂。
And with a mental and legal equipment which for shrewdness and self-interest was not unlike that of lynx or a ferret.
youdao
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