An extraordinary individual.
A small marble of little worth in children's games.
The winner was the last to flick a marble into the gully. A oner had to beat a fourer four times to win, a fourer had to beat a twelver three times, and so on.
A conker that has won one match.
May all your conkers be oners / May your love life fail with dishonours
From one + -er.
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