Shirabe
降下

降下こうか

Common Noun Irregular Intransitive
English jmdict
1
noun (common) (futsuumeishi)noun or participle which takes the aux. verb suruintransitive verb descent;fall;drop;(atmospheric) depression
その大型機は鋭い音を立ててほとんど直角に降下した。
The giant plane screamed down in an almost vertical dive.
2
noun (common) (futsuumeishi)noun or participle which takes the aux. verb suruintransitive verb passing down (of an order, decree, etc.)