The ideology, principles, or practice of supporting and maintaining established institutions, power structures, and the status quo.
From 'establishment' plus the suffix '-ism' (denoting a system of beliefs or practices). This term emerged in 20th-century political criticism.
The '-ism' suffix transforms a simple noun into an entire worldview—'establishmentism' sounds like a philosophy you can argue against, which is why critics use it rather than just saying 'supporting the establishment'!
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