the world > the earth > water > flow or flowing > state of sea > have or be in specific kind of motion [verb (intransitive)] > become rough (2)
arisec950
To rise in violence or agitation, as the sea, the wind; to boil up as a fermenting fluid, the blood; so of the heart, wrath, etc. Now poetic: see rise…
rough1876
intransitive. To become rough or stormy. Also with up.