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Put it in a bond fund like the one below?
https://flagship.vanguard.com/VGApp/...FundIntExt=INT
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I keep most of my spare ready-to-go cash in an ultra-short bond fund. The above is just a short-term bond fund so it may have more fluctuations. Doesn't make it bad, though. Just realize if interest rates twitch the fund price may twitch the other way a bit more in a short-term fund than an ultra-short fund. Something like, say, MWUSX.