wild oat

noun
  1. any uncultivated species of Avena, especially a common weedy grass, A. fatua, resembling the cultivated oat.
  2. a hardy plant, Uvularia sessilifolia, of the lily family, of eastern North America, having deep green, hairy leaves and greenish-yellow, tubular flowers.
Idioms
  1. sow one's wild oats, to have a youthful fling at reckless and indiscreet behavior, especially to be promiscuous before marriage.

Origin of wild oat

First recorded in 1490–1500
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for wild oat

wild oat

noun
  1. any of several temperate annual grasses of the genus Avena, esp A. fatua, that grow as weeds and have long bristles on their flower spikes
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012