noun
A grey rhino is a large mammal with thick skin and one or two horns on its nose.
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The grey rhino is a metaphor for a highly probable, high-impact yet neglected threat.
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I heard that the grey rhino is a term used to describe a big and obvious problem that people are ignoring.
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Yo, did you see that grey rhino walking down the street? It's like a huge problem just waiting to happen.
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The grey rhino in the room is the looming economic crisis that no one wants to address.