de rigueur

Meanings

1. 1
   adj

   required by custom, etiquette, convention, or current fashion

   Formal evening dress was de rigueur at the diplomatic reception.

Borrowed from French de rigueur, literally "of strictness" or "required by strict usage," from de ("of") + rigueur ("strictness, severity"). English adopted the phrase for whatever convention or fashion makes practically compulsory.

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