Etymology
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sobriquet (n.)

1640s, from French sobriquet "nickname," from French soubriquet (15c.), which also meant "a jest, quip," and is said to have meant literally "a chuck under the chin" [Gamillscheg]; of unknown origin (first element perhaps from Latin sub "under").

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Brother Jonathan (n.)
sobriquet for "United States," 1816, often connected with Jonathan Trumbull (1740-1809) of Connecticut, who was called Brother Jonathan by George Washington, who often sought his advice, somehow in reference to 2 Sam i:26.
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