Why is 桃 related to water?

Hi, someone told me that an 'oath of water' can be expressed with the character '桃'.

But 桃 means peach, love, and pink, would really appreciate your help in clarifying why 桃=水.

Thanks again :)

submitted by /u/harten
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from r/ChineseLanguage: a community for people who are studying, teaching, or interested in Chinese! https://www.reddit.com/r/ChineseLanguage/comments/9q7jq5/why_is_桃_related_to_water/

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