A person or force that disestablishes an institution, particularly a church.
From disestablish plus the agent suffix -er. This term emerged in 19th-century political discourse, particularly in British church debates.
William Ewart Gladstone, a famous British Prime Minister, was called a 'disestablisher' because he fought to disestablish the Church of Ireland. Being a disestablisher was controversial—religious leaders opposed him fiercely!
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