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1. (Gambling, except Cards) gambling a type of bet whereby the better guesses whether a given statistic, usually the combined score of sport match, will be higher or lower than a bookmaker's prediction
2. (Firearms, Gunnery, Ordnance & Artillery) a two-barrelled firearm with one barrel on top of the other
(Firearms, Gunnery, Ordnance & Artillery) (of a two-barrelled firearm) having one barrel on top of the other
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014