idiom > Shy Yen heaven and earth
Contents
腼 Yan night and day
  Explanation: Mian Yan: thick with the face. Night and day: Heaven and Earth, refers to the human world. Describe the cheek to live in this world.
No. 2
  词 目 腼颜天壤
  发 音 miǎn yán tiān rǎng
  释 义 腼颜:厚着脸面。天壤:天地,指人世间。形容厚着脸皮活在人世间。
  出 处《晋书·郗鉴传》:“丈夫既洁身北面,义同在三,岂可偷生屈节,靦颜天壤邪!”