But the dictionary says....

Students often trust a small electronic device with a small electronic voice more so that the living, breathing personification of the English language in front of them (ie me!) One of the strange (and down right dangerous events for a "safety country") is the piggy back fight on Sports Day.  It has the twist that you have to grab the cap of the opposing team member to win.  The dictionary came up with "Cavalier battle" so no one was that interested in the correct "piggy-back" despite me saying "Are you a soldier?"  It didn't help that 'battle' is a Japanese-English word.