降下こうか
kōka

Noun
Suru Verb

1. descent; fall; drop; (atmospheric) depression

Intransitive
その大型おうがたするどおとててほとんど直角ちょっかく降下こうかした。
sono ōgatakiwa surudoi otō tatete hotondo chokkakuni kōka shita.
The giant plane screamed down in an almost vertical dive.
Noun
Suru Verb

2. passing down (of an order, decree, etc.)

Intransitive