资料来源 : Webster's Revised Unabridged Dictionary (1913)

Boxing day \Box"ing day`\
   The first week day after Christmas, a legal holiday on which
   Christmas boxes are given to postmen, errand boys, employees,
   etc. The night of this day is boxing night. [Eng.]

资料来源 : WordNet®

Boxing Day
     n : first weekday after Christmas