noun, noun or participle which takes 'suru', transitive verb, intransitive verb
flowing down; downward flow
Describes water or other substances moving downward, often in a river or channel. Can be used as a noun or with する for both transitive and intransitive actions.
川の水がゆっくりと流下している。
The river water is flowing down slowly.
ダムから水を流下させる。
They release water downstream from the dam.
Compound of 流 (ryū, 'flow') and 下 (ka, 'down'). The exact historical derivation is uncertain, but the meaning is transparent from its components.