Learn English – the etymology of the shift dress

It means (according to my trusty New Webster's Encyclopedic Dictionary):

1. to make full or complete again
2. to supply with fresh fuel
3. to fill again or anew
4. (intransitively) to become full or complete again

According to another dictionary (the one built-in in Mac OS X), the origin of the word can be traced to Old French (and further to Latin, of course), as follows:

ORIGIN late Middle English (in the sense [supply abundantly] ): from Old French repleniss-, lengthened stem of replenir, from re- ‘again’ (also expressing intensive force) + plenir ‘fill’ (from Latin plenus ‘full’ ).

Based on that, I don't think it has had other meanings in English earlier. As to why should one use this word instead of the less fancy refill – I have no idea, except perhaps to show off & try to sound educated.

A definitive answer appears hard to give, anyway to your research I'd add the information offered by The Phrase Finder which has a different story to tell linked to 'pugilism'. Everything considered, to me the tradition to give Christmas boxes with gifts to tradespeople and servants appears to be the most plausible:

• 'Christmas boxes' were originally literally earthenware boxes. In mediaeval England these boxes were used by the poor (servants, apprentices etc.) to save money throughout the year. At Christmas the boxes were broken open and the savings shared to fund Christmas festivities. This meaning of 'Christmas box' dates back to at least the early 17th century. The boxes were known in France as tirelire and are referred to in Randle Cotgrave's A Dictionarie of the French and English tongues, 1611:

• "Tirelire, a Christmas box; a box having a cleft on the lid, or in the side, for money to enter it; used in France by begging Fryers, and here by Butlers, and Prentices, etc."

• In a similar tradition, which is almost as old as the above and which is the one that has stayed with us until the present day, Christmas boxes are gifts, usually money, given to tradespeople or others who have rendered some service throughout the year but who aren't normally paid directly by the donor - for example, office cleaners, milkmen etc.

• So, why is Boxing Day so called? Sporting fixtures, which used regularly to include boxing, have taken place over the holiday season for centuries. The view that Boxing Day was a day for pugilism gets some support via the earliest reference to the name that I can find, which is in The Sporting Magazine, Volume 25, 1805:

• On boxing-day, Dec. 26, a numerous assemblage of the holiday folk were amused by a hard fought battle, in St. Pancras-fields. This fight was one that afforded plenty of diversion to several pugilists and admirers of the art present.

• Nevertheless, the link to boxing in that citation is purely co-incidental and the origin of the name is the giving of 'Christmas box' gifts to tradespeople, which traditionally took place not on Christmas Day but on the first subsequent working day.

This article of TIME try to shed some light on its origin:

• The best clue to Boxing Day's origins can be found in the song "Good King Wenceslas." According to the Christmas carol, Wenceslas, who was Duke of Bohemia in the early 10th century, was surveying his land on St. Stephen's Day — Dec. 26 — when he saw a poor man gathering wood in the middle of a snowstorm. Moved, the King gathered up surplus food and wine and carried them through the blizzard to the peasant's door. The alms-giving tradition has always been closely associated with the Christmas season — hence the canned-food drives and Salvation Army Santas that pepper our neighborhoods during the winter — but King Wenceslas' good deed came the day after Christmas, when the English poor received most of their charity.

• King Wenceslas didn't start Boxing Day, but the Church of England might have. During Advent, Anglican parishes displayed a box into which churchgoers put their monetary donations. On the day after Christmas, the boxes were broken open and their contents distributed among the poor, thus giving rise to the term Boxing Day. Maybe.

• But wait: there's another possible story about the holiday's origin. The day after Christmas was also the traditional day on which the aristocracy distributed presents (boxes) to servants and employees — a sort of institutionalized Christmas-bonus party. The servants returned home, opened their boxes and had a second Christmas on what became known as Boxing Day.

• So which version is correct? Well, both. Or neither. No one, it seems, is really sure. Both the church boxes and the servant presents definitely existed, although historians disagree on which practice inspired the holiday.

Early citation of 1809:

• from page 321] ... Never alter your dress at this time [the Christmas holidays and boxing- day], but wear the worst of every thing you have; (from Le Beau Monde, or Literary and Fashionable Magazine, 1806-1810Volume 4, No. 30 For January, 1809)

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