noun, noun which may take the genitive case particle 'no', noun or participle which takes 'suru'
directly under; immediately below; directly subordinate to
Used for physical position directly underneath something, and by extension for being directly under an authority or organization. Often appears as 直下に, 直下の, or in compounds.
ビルの直下を地下鉄が通っている。
A subway line runs directly under the building.
首相直下のチームが
A team directly under the prime minister handled the response.
noun, noun or participle which takes 'suru'
fall straight down; drop vertically
A less common する-verb use meaning to descend or fall almost perpendicularly; often found in descriptive or technical writing about terrain, waterfalls, or movement.
滝が岩壁を直下している。
The waterfall drops straight down the rock face.