wrong'un

Noun

wrong 'un (plural wrong 'uns)

1. (UK, derogatory, slang) A dishonest or disreputable person; a crook or rogue.
   • We might not have had that much to pinch, but they'd still have your brass candlesticks off the mantelpiece. There's always wrong 'uns, in every walk of life, who'll have whatever you've got from under your nose.2000, Gilda O'Neill, My East End: Memories of Life in Cockney London
2. A googly.
3. A horse deliberately held back in order to lose a race.