A person or thing that dacks (Australian slang), or historically, someone who works with or transports goods; a laborer or porter.
From 'dack,' which has multiple etymologies depending on context: in Australian slang it means to pull down someone's pants (possibly from 'Dacca' trousers), and historically it relates to carrying goods. The '-er' suffix indicates a person who does this activity.
The word 'dacker' is almost extinct now, but its history shows how occupational names worked—just as a 'baker' bakes and a 'butcher' cuts meat, a 'dacker' was someone who dacked or transported things, a naming system so ancient it's embedded in English surnames.
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