Etymology

orra

O1R1R1A1

Today it means: Superfluous; odd, unmatched, left over. Full definition →

First used 16th c.
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The story

Probably originally a reduced form of over + all.

First known use, by meaning

  • from 16th c. Of people: idle, unemployed, disreputable.

Etymology from Wiktionary, CC BY-SA 4.0.