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The carol "Deck the halls" or "Deck the hall" or "'Tis the season" is a traditional Christmas carol with a Welsh melody dating to the 1500's. The English lyrics from 1862 are from the winter carol tune "Nos Galan". Later lyrics from 1877 remove the references to drinking.
The word "'tis" is a contraction of "it is". The phrase "deck of cards" appears to have come from "covering" to "deck on a ship" to a "deck of cards" as being stacked together into a pack.
How does a deck of cards get around?
It shuffles.
2. Cover the halls
The Christmas carol "deck the halls" means to "cover the halls".
The Middle English word "decke" ≈ "deck" as a raised flat surface covering what is underneath.