purify

verbs

remove impurities from, increase the concentration of, and separate through the process of distillation
"purify the water"
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make pure or free from sin or guilt
"he left the monastery purified"
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become clean or pure or free of guilt and sin
"The hippies came to the ashram in order to purify"
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is a type of (narrower)
undergo a change; become different in essence; losing one's or its original nature
"She changed completely as she grew older"; "The weather changed last night"