cantrip (n.)youdaoicibaDictYouDict[cantrip 词源字典]
"magical spell," 1719, a Scottish word of uncertain origin; despite much speculation it is unclear even where the word is divided, whether the second element is rope (perhaps a reference to knotted cords as magical devices) or trappa "a step" or some other thing.[cantrip etymology, cantrip origin, 英语词源]