讳莫如深 (huì mò rú shēn) | Meaning: (idiom) to steadfastly refuse to discuss the matter; to treat it as an untouchable subject | Chinese Idiom with Pinyin & Origin

to withhold information · to keep sth secret秘而不宣mì ér bù xuān

lit. to guard one's mouth like a closed bottle (idiom); tight-lipped · reticent · not breathing a word守口如瓶shǒu kǒu rú píng

profound mystery高深莫测gāo shēn mò cè

to conceal · to hide behind · to cover up掩盖yǎn gài

(idiom) to be kept secret; not to be divulged不可告人bù kě gào rén

(idiom) to steadfastly refuse to discuss the matter; to treat it as an untouchable subject