What does Boxing Day have to do with boxing?
Old English bar "boar," from West Germanic *bairaz (cf. Old Saxon ber, Dutch beer, Old High German ber), of unknown origin with no cognates outside West Germanic. Applied in Middle English to persons of boar-like character.
occurs only in Ps. 80:13. The same Hebrew word is elsewhere rendered "swine" (Lev. 11:7; Deut. 14:8; Prov. 11:22; Isa. 65:4; 66:3, 17). The Hebrews abhorred swine's flesh, and accordingly none of these animals were reared, except in the district beyond the Sea of Galilee. In the psalm quoted above the powers that destroyed the Jewish nation are compared to wild boars and wild beasts of the field.