Défi de janvier - roughly pronounced deh-fee duh jahn-vee-aye - translates literally as the ‘challenge of January’, though you may have inferred that the contest in question is ‘Dry January ...

Katherine C. Kurk, Philippe Sollers' "Le Défi": Texte de plaisir, texte de jouissance, South Atlantic Review, Vol. 47, No. 4 (Nov., 1982), pp. 27-36 Free online reading for over 10 million articles ...