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Related to dinkum: Fair Dinkum
[Originally Australian dialectal, fair share of work, from English dialectal (Lincolnshire and Derbyshire) dincum, dinkum, work; perhaps akin to English dialectal (Gloucestershire) ding, to work, perhaps from Middle English ding, to work, perhaps from Middle English dingen, to strike, hammer, thresh; see ding2.]
1. genuine or right: a dinkum bloke.
2. fair dinkum genuine or true: used to emphasize the truth of something or in asking for the truth of something to be confirmed: Back to the states? Fair dinkum?.
3. dinkum oil archaic the truth
[C19: from English dialect: work, of unknown origin]
[1890–95; of obscure orig.]