blue light

noun

Definition of blue light 

usually disparaging

: a member of that wing of the American Federalist party that bitterly opposed the War of 1812

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History and Etymology for blue light

so called from the allegation of Commodore Stephen Decatur †1820 American naval officer that on the night of December 12, 1813 American Federalists traitorously signaled to the British by means of blue lights on either end of the mouth of the harbor at New London, Connecticut

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