Boxing Day
(in Britain) 26 December, the day after Christmas Day. It is a bank holiday. Traditionally it was the day when people gave Christmas boxes (small gifts of money) to their employees or servants. Now most people relax, digest the food and drink of the day before, and perhaps visit friends or relatives.
(NB : a bank holiday = un jour férié. -- cf. un jour où les banques sont fermées)

I wanna... bioman, bioman, défenseur de la teeeerrrreee