缄口不言，汉语成语，拼音是jiān kǒu bù yán，意思是封住嘴巴；不开口说话。出自《明史 何遵传》。
看到峡谷边缘的大鳄鱼时，我们都警惕地缄口不言了。
We kept silent, on the lookout for the large crocodiles that were visible from the rim of the canyon.
但是，一旦用户意识到他们的数据是怎样被使用的，他们可能就会缄口不言了。
But if users realise how their data are used, they may clam up.
斯卡洛尼一向对媒体很友好，不过这次他对利比亚局势缄口不言，一直持观望态度。
The normally media-friendly chief executive has stayed mum on the situation and has taken a wait-and-see approach.
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