These waters?

[crazYgeeK]

I've learned that "water" is an uncountable noun, isn't it?
But, yesterday I saw it used as a countable noun in a sentence in an English website, the sentence is "These waters aren't silent"
What about the truth?
Thank you so much!

[freezeframe]

waters,

a. flowing water, or water moving in waves: The river's mighty waters.

b. the sea or seas bordering a particular country or continent or located in a particular part of the world: We left San Diego and sailed south for Mexican waters.

Waters | Define Waters at Dictionary.com

The word "waters" is also used in a number of idioms. Examples:

"muddy the waters" -- to make something like an issue or situation more confusing

"still waters run deep" -- you say this about a person who's very quiet but has an interesting personality or interesting thoughts

"(to) test the water(s)" -- find out if something will be successful or if would you like it before you try it

[BobK]

Another idiom: 'stormy/choppy/rough waters' = an area* where things aren't placid

* - which can be metaphorical. A marriage might go through choppy waters. ( If it gets much worse, the marriage will be 'on the rocks'.

b