天が下

Etymology
Compound of.

Arose as the native Japanese kun'yomi for compound. Compare also 🇨🇬, modern 🇨🇬.

Generally superseded by the term, using the more modern possessive particle.

Noun

 * : the whole world, under heaven; the people of the country or nation; the imperial court; the administration, the government; all of Japan

Idioms

 * : “to know the lands under heaven” → to control all of Japan, to reign supreme