Sobriquet definition is - a descriptive name or epithet : nickname. A sobriquet or soubriquet is a nickname, sometimes assumed, but often given by another and being descriptive in nature. A sobriquet (/ˈsoʊbrɪkeɪ/ SOH-bri-kay) or soubriquet is a nickname, sometimes assumed, but often given by another and being descriptive in nature. 6 days ago · Meaning of sobriquet in English.