What does Boxing Day have to do with boxing?
1560s, noun of action from elucidate.
1560s, perhaps via Middle French élucider (15c.) or directly from Late Latin elucidatus, past participle of elucidare "make clear," from ex- "out, away" (see ex-) + lucidus "clear" (see lucid). Related: Elucidated; elucidates; elucidating.