What does Boxing Day have to do with boxing?
c.1300, from Old French tripe "entrails used as food" (13c.), of unknown origin, perhaps via Spanish tripa from Arabic therb "suet" (but also said to mean "fold of a piece of cloth"). Applied contemptuously to persons (1590s), then to anything considered worthless, foolish, or offensive (1892).
An arrest; a prison sentence; fall
[1920s+ Underworld; fr trip, ''stumble, fall'']