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Related to dinkum: Fair Dinkum
slang True. Primarily heard in Australia. I have information that proves that explanation to be fair dinkum, so you should believe it.
the very dinkum
Something that is exemplary or perfect. Wow, your hairdo is the very dinkum—you look gorgeous!
fair dinkumAUSTRALIAN, INFORMAL
If you describe someone or something as fair dinkum, you mean that they are real, fair or honest. I think that convinced people that I was fair dinkum and wouldn't cheat. If you're doing a fair dinkum inquiry, you need the best and most experienced person.
fair dinkum1 genuine or true. 2 (of behaviour) acceptable. Australian & New Zealand informal
As a noun dinkum , recorded from the late 19th century, was an English dialect word meaning ‘hard work, honest toil’; it now mainly features as an adjective in various Australian and New Zealand expressions.
ˌfair ˈdinkum(AustralE, New Zealand, informal)
1 used to emphasize that something is genuine or true, or to ask whether it is: It’s a fair dinkum Aussie wedding. ♢ ‘Burt’s just told me he’s packing up in a month.’ ‘Fair dinkum?’
2 used to emphasize that behaviour is acceptable: They were asking a lot for the car, but fair dinkum considering how new it is.