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The word Unicorn is uni-corn, as in one corn(horn).
(lemmy.world)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
The post is in the positives so I think you're ok. If I had to guess on the downvotes though it's not really a groundbreaking discovery that uni-corn can be broken into two words like that.
28 up 18 down so far!
I always took unicorn as one word, I never thought about the uni part meaning one.