What does Boxing Day have to do with boxing?
1940, from of German Panzerdivision "armored unit," from Panzer "tank," literally "armor," from Middle High German panzier, from Old French panciere "armor for the belly," from pance "belly, stomach," from Latin pantex (genitive panticis) "belly" (see paunch).
series of battle tanks fielded by the German army in the 1930s and '40s. The six tanks in the series constituted virtually all of Germany's tank production from 1934 until the end of World War II in 1945. Panzers provided the striking power of Germany's panzer (armoured) divisions throughout the war.