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Why do people say "symbiotic relationship" when they really mean "mutualistic"?
(self.showerthoughts)
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. A showerthought should offer a unique perspective on an ordinary part of life.
Because they don't know the difference. People don't tend to use expressions or sayings wrong on purpose. Most never investigate the meanings or etymology, they're using them and are understood by the like-minded.