To eliminate, or destroy by fast moving water, such as in a flood, or a high sea.(verb)
To eliminate, in a figurative sense.(verb)
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Use "wash away" in a sentence
"Carnac and Luxor are but names, or if their skeletons remain, still more desert sand, and at length a wave of the Mediterranean Sea are needed to wash away the filth that attaches to their grandeur."
"That evening, after my father returned home, the smell of the soap he had used to wash away the traces of Marilyn Hyde's death still strong upon him, he sat at our kitchen table and opened a bottle of Coors."
" The mountain warrior struggled to clear the centaur's eyes, scouting for water among the fallen to wash away the poison and quench the druid's raging thirst."