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The phrase "a pet theory" is correct and usable in written English.
It can be used to refer to a personal theory or idea that someone is particularly fond of, often without substantial evidence.
Example: "She often shares her pet theory about the influence of diet on mental health during our discussions."
Alternatives: "personal theory" or "favorite hypothesis".
Exact(38)
I have a pet theory about what's going on.
As it happens, I have a pet theory about that, too.
A pet theory of mine, not the author's, but I thought I'd toss it in here.
Many scholars have leaped to promote a pet theory, which often coincided with a favorite policy recommendation.
Time after time, theorists invent a particle they need for a pet theory to work and -- voila!
All you need is a pet theory, and an idea for an experiment you can do to test it.
Similar(22)
If I were the sort of amateur scholar who nurtured a crankish pet theory about Shakespeare and I'm not, I promise mine would have to do with hidden references in "Henry V" to the relationship between Catherine of Valois and Owen Tudor, whom she took up with after Henry's death.
Nor will it be good for public health for a similar raft of activity to prove an analyst's pet theory about the benefits of some potion in some vague indication.
Observers are hoping for a mention of his pet theory that the Nazis invented UFOs, and still fly them from a base in Antarctica.
When the writer Jorge Luis Borges gave a talk about his pet theory that the best metaphors are cliched dead metaphors -- time is a river, life is a dream -- the sound was piped out the door of a big auditorium so the overflow crowd of young acolytes could hear.
Now a radiocarbon study concludes that much of the assumed chronology was right, though it corrects some controversial dates and may overturn a few pet theories.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com