English teacher
Because it refers to more than one sea.
We went down in rough seas.
But: The rough sea prevented us from sailing that night.
WW

Student or Learner
Dear teachers
In the phrase of rough seas, why should sea be in the plural?
Thank you in advance.
English teacher
Because it refers to more than one sea.
We went down in rough seas.
But: The rough sea prevented us from sailing that night.
WW
Rough seas is an expression used to describe a challenging time or experience.
He's facing rough seas ahead.
It also can be quite literal.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.
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