Definition of treble chance in English:

treble chance

noun

British
  • [mass noun] A form of football pool in which different numbers of points are awarded for a draw, an away win, and a home win.

    • ‘Dobbin can also land the John Wade Selling Handicap Hurdle on Ball Games, while Lahib The Fifth, twice a winner for Nicky Richards, can provide Dobbin with a treble chance in the Jewson Novices' Hurdle Qualifier.’