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Showing results for feel one's oats. Search instead for To+feel+one's+oats.
Synonyms

feel one's oats

Idioms  
  1. Feel frisky or animated, as in School was out, and they were feeling their oats . This usage alludes to the behavior of a horse after having been fed. [Early 1800s]

  2. Display self-importance, as in He was feeling his oats, bossing everyone around . [Mid-1800s]