What does Boxing Day have to do with boxing?
Old English bodian "proclaim, announce; foretell," from boda "messenger," probably from Proto-Germanic *budon- (cf. Old Saxon gibod, German gebot, Old Norse boð), from PIE *bheudh- "be aware, make aware" (see bid (v.)). As a shortened form of forebode (usually evil), it dates from 1740. Related: Boded; boding.