folie de grandeur
noun
a delusion of grandeur; megalomania.
The grammatical form denoting more than one person, place, thing, or idea.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
For Sinclair, the grandest of these folies de grandeur, the whitest of these white elephants, is the 2012 Olympics site, whose construction has been under way in east London for four years now.
From The Guardian ● Jul. 15, 2011