三缄其口，汉语成语，拼音是sān jiān qí kǒu，意思是形容说话谨慎。也用来形容不肯或不敢开口。出自《太公金匮》。
警方已呼吁目击者出来作证，但看来当地人都三缄其口。
Police have appealed for witnesses, but it seems the locals are keeping shtum.
现在，外来食肉植物的黑市交易非常活跃，以至于植物学家一直对某些稀有物种的位置三缄其口。
The black market trade in exotic carnivorous plants is so vigorous now that botanists are keeping the location of some rare species a secret.
我打破了家人对父母破碎婚姻三缄其口的家庭禁忌。
I shattered the family taboo of silence about the break-up of my parents' marriage.
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