Sentence:  <WSD>Boxing Day</WSD> is celebrated on December 26 each year and is a national holiday in the UK. ... <WSD>Boxing Day</WSD> is a time to spend with family or friends, particularly those not seen on Christmas Day itself. It is also a day to eat left over turkey. ... <WSD>Boxing Day</WSD> is also a time when the Brits show their eccentricity by taking part in all kinds of bizarre traditions including swimming the icy cold English Channel, or running into the sea, fun runs and charity events. December 26 is a big day for sales too. Dramatic price reductions lure out millions of shoppers who even queue for hours before the shops open. 
Meaning of the word marked with <WSD> tags:  The day after Christmas; the 26th of December.