Usage patterns
〈事〉はでっち上げだ〈something〉 is a fabrication
It later came to light that the incident was a fabrication.
でっち上げの〈事〉a fabricated 〈story/charge/etc.〉
He was accused based on fabricated evidence.
でっち上げが発覚するfor a fabrication to come to light
The article's fabrication was exposed, and the reporter was fired.
