shilly-shally (v.)youdaoicibaDictYouDict[shilly-shally 词源字典]
"to vacillate," 1782, from adverbial expression to stand shilly-shally (1703), earlier shill I, shall I (1700), a fanciful reduplication of shall I? (compare wishy-washy, dilly-dally, etc.). From 1734 as an adjective, by 1755 as a noun. Related: Shilly-shallying (1816).[shilly-shally etymology, shilly-shally origin, 英语词源]