Some other words that are sorely missing from dictionaries: "Warm water", "hot water", "cold water", "dirty water"
Are there idiomatic expressions for warm/cold/dirty water, which mean something other than a literal adjective describing the temperature or condition of water?
https://www.merriam-webster.com/dictionary/hot%20water
> warm water - n. an ocean or sea not in the arctic or antarctic regions
https://www.merriam-webster.com/dictionary/warm%20water
> cold water - n. depreciation of something as being ill-advised, unwarranted, or worthless. e.g. threw cold water on our hopes
https://www.merriam-webster.com/dictionary/cold%20water
Seems that what makes sense to be in dictionaries is already there.
Depending on the context you got sewage, slush, runoff, murk, waste etc.