sludge
The origin and history of sludge.
Etymology
From Middle English words for mud and mire, ultimately related to the Old English root behind "slush" — sludge and slush share a common muddy ancestor.
The origin and history of sludge.
From Middle English words for mud and mire, ultimately related to the Old English root behind "slush" — sludge and slush share a common muddy ancestor.