brown water

== English == === Noun === brown water (uncountable) (nautical, often attributive) Inland (river) or coastal waters, in contrast to blue water. 2011, Committee on Blue Water Navy Vietnam Veterans and Agent Orange Exposure, Institute of Medicine, Blue Water Navy Vietnam Veterans and Agent Orange Exposure: […] ships [...] that served [...] primarily or exclusively in inland waterways, [...] categorized as brown-water ships or [personnel] who served on such ships before or after the designated period of brown water activity are not eligible [...]