as mute as a fish ; taciturnity ; maintain discreet silence ; C cool as a cucumber
Langlock
Silenced ; AllShutMix ; hush-hush
出自《后汉书·杜密传》,意思是闭口不作声。 噤若寒蝉:像深秋的蝉那样一声不吭。比喻因害怕有所顾虑而不敢说话。 或指因寒冷而咬紧牙关或牙齿打战