A grape with a loose skin that can easily be slipped off.(noun)
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Use "slipskin" in a sentence
"For example, my six year-old is madly in love with the small blue slipskin grapes on a chainlink fence around an old house in Saratoga."
"The “package” t’Radaik had promised her, the data chip, was waiting for her in a little slipskin envelope on the somewhat-scratched glass table when Arrhae came back from the afternoon session."