not willing to talk about something 口紧的；缄口不语的；守口如瓶的 Despite the rumours, government officials remained tight-lipped today. 尽管有谣言，政府官员今天仍然保持沉默。
keeping your lips pressed together, especially because you are angry about something 双唇紧闭的（尤指因生气） He marched out of the room tight-lipped and white-faced. 他双唇紧闭地走出了房间。 a tight-lipped reply 口口相传