"The car's cactus - won't start."
Where "Cactus" Comes From
The exact origin of "cactus" for something broken or dead is uncertain, with no clear documented source, though it likely leans on the image of a prickly, unwanted plant nobody has any use for.
The slang sense has been part of Australian English since at least the mid-20th century, and it's stayed remarkably consistent in meaning ever since, unlike many slang terms that drift over time.
How Aussies Actually Use It
"Cactus" is a simple, blunt way to say something no longer works — a car, an appliance, a plan, even a relationship can all be described as cactus.
It's occasionally stretched to describe a person who's exhausted or worn out, though "broken or not working" remains by far its most common use.
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