English to Spanish Art/Literary Education / Pedagogy

¿Qué quiere decir to dash in a shiver of waters? El contexto es el siguiente:
The sea, though it was a thin and sparkling water here, which seemed incapable of surge or anger, eventually narrowed itself, clouded its pure tint with grey, and swirled through narrow channels and dashed in a shiver of broken waters against massive granite rocks. It was this sea that flowed up to the mouth of the Thames.

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