What does Boxing Day have to do with boxing?
c.1400, "to bestow grace upon;" 1530s, "to show gratitude to," from French gratifier (16c.) or directly from Latin gratificari "to do favor to, oblige, gratify," from gratus "pleasing" (see grace) + root of facere "make, do, perform" (see factitious). Meaning "to give pleasure to" is from 1560s. Related: Gratified; gratifying.