kvetch (v.)youdaoicibaDictYouDict[kvetch 词源字典]
"to complain, whine," 1953 (implied in kvetching), from Yiddish kvetshn, literally "squeeze, press," from German quetsche "crusher, presser." As a noun, from 1936 as a term of abuse for a person.[kvetch etymology, kvetch origin, 英语词源]