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plural fearnaughts
A fearless person. examples
A stout woolen cloth of great thickness; dreadnought quotations examples
[T]he crew however stand it tolerable well, each being cloathed with a Fearnought jacket, a pair of trowsers of the same and a large cap made of canvas & baize, these together with an additional glass of brandy every morning enables them to bear the cold without flinshing.
1772, James Cook, The Journals, Second Voyage, 4 January
(by extension) A warm garment, especially one made of this cloth. examples