little englander

little englander
Usage: usually capitalized L&E
: an Englishman opposed to territorial expansion of the British Empire and usually anticipating the gradual voluntary secession of existing possessions therefrom

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ˌLittle ˈEnglander 7 [Little Englander Little Englanders] noun (usually disapproving)
an English person who believes England (or, in practice, Britain) should not get involved in international affairs

Useful english dictionary. 2012.