不显山不露水

不顯山不露水
bùxiǎnshānbùlùshuǐ
lit. to not show the mountain and to not reveal the water (idiom); fig. to hide the key facts

CEDICT

Entry Composition

1 不显 bùxiǎn unclear; nonovert; indistinct
2 山 shān (coll.) small bundle of straw for silkworms to spin cocoons on

classifier: 座
3 不 bù
  1. no; not so
  2. (bound form) not; un-
4 露水 lùshuǐ
  1. dew
  2. fig. short-lasting
  3. ephemeral