A person who interferes with a racehorse or greyhound in order to prevent it from winning a race.
(Australia, obsolete) A serving of beer or spirits.
1874, [John Brady], The McIvor Times and Rodney Advertiser (Heathcote, Vic. : 1863 - 1918) Thursday 24 December 1874 Coroner's Inquest http://trove.nla.gov.au/ndp/del/article/89693062#pstart8412354 - 12-year-old witness to road accident death of his father,
‘My father only had two nobblers at Dwyer's place that morning.’
1895, Guy Boothby, A Bid for Fortune, ReadHowYouWant, 2008 EasyRead Comfort Edition, page 266,
‘A nobbler o′ rum,’ says I. Then he orders a nobbler of rum for me and a nobbler of whisky for ′imself.
(UK, obsolete) A thimbleman's or cardsharp's accomplice or shill, who poses as a player of the game to suggest that it is easy to win.