shrove (n.)youdaoicibaDictYouDict[shrove 词源字典]
"shrift, shriving," 1570s, shortened from Shrovetide (early 15c.), from schrof-, related to schrifen (see shrive). Shrove Tuesday (c. 1500) is from practice of celebration and merrymaking before going to confession at the beginning of Lent.[shrove etymology, shrove origin, 英语词源]