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'de rigueur' means 'obligatory' in French.
Tuxedos are de rigueur for men at weddings.
De is pronounced DUH
rigueur is pronounced RIG.air
De rigueur; to become the accepted practice, fashion or thing
New wave music became de rigueur in the 1980's
Compulsory, Obligatory or Requiredmay be English equivalents of 'de rigueur'.