皇天后土

huángtiānhòutǔ
heaven and earth (idiom)

CEDICT

the gods of heaven and earth

Wiktionary

天地神明。多用于祝告宣誓。

重編國語辭典

Entry Composition

=1 皇天 Huángtiān August Heaven; Heaven as supreme deity (often paired with 后土 Hòutǔ, the Earth Deity)
=1 皇天 huángtiān
  1. (Wenzhounese) oh my God
  2. oh my God
  3. the great and almighty heavens above
=2 后土 Hòutǔ Earth Deity (often paired with 皇天 Huángtiān, August Heaven)
=2 后土 hòutǔ
  1. (literary) earth god; Houtu
  2. (literary) the vast earth
  3. (literary, of ancient China) official charged with managing land
  4. earth god; Houtu
  5. official charged with managing land
  6. the vast earth

Related entries

两仪 liǎngyí
  1. heaven and earth
  2. yin and yang
天地 tiāndì
  1. heaven and earth
  2. world
  3. scope
  4. field of activity
山无棱，天地合，我就跟你走。

I'll go with you when pigs fly.

Source: Tatoeba