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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.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
[1890–95; of obscure orig.]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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adjective (Austral. & N.Z. informal) genuine, honest, natural, frank, sincere, candid, upfront (informal), artless, guileless He was a fair dinkum bloke with no pretensions.
Collins Thesaurus of the English Language – Complete and Unabridged 2nd Edition. 2002 © HarperCollins Publishers 1995, 2002