wild oat
noun
1
: any of several Old World wild grasses (genus Avena)
especially
: a Eurasian annual weed (A. fatua) common in meadows and pastures
2
wild oats plural
: offenses and indiscretions ascribed to youthful exuberance
—usually used in the phrase sow one's wild oats
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Merriam-Webster unabridged
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