Definition of dead 'un in English:

dead 'un

phrase

Australian
informal
  • A loser, especially a racehorse that is made to lose deliberately.

    ‘the trick to picking the Cup winner was always to pick the dead 'un in the race before every Cup’
    • ‘She ran second in Perth on a dead 'un.’
    • ‘On selected events they could run a 'Mystery Dead Un' feature.’
    • ‘After the event Stewards would declare the dead un with correct weight.’
    • ‘I didn't have the ability, as the term was in those days, to run a dead un.’
    • ‘You might be riding a dead 'un, not supposed to win.’