What does Boxing Day have to do with boxing?
"earthen jug," c.1200, from Old French pichier (12c.), altered from bichier, from Medieval Latin bicarium, probably from Greek bikos "earthen vessel" (see beaker). Pitcher-plant is recorded from 1819; so called for its resemblance.
"one who pitches," 1722, agent noun from pitch (v.1). Originally of one tossing hay into a wagon, etc.; baseball sense first recorded 1845.
a vessel for containing liquids. In the East pitchers were usually carried on the head or shoulders (Gen. 24:15-20; Judg. 7:16, 19; Mark 14:13).