sitzkrieg (n.)youdaoicibaDictYouDict[sitzkrieg 词源字典]
1940, "static warfare" (such as prevailed in Europe in the winter of 1939-40), R.A.F. coinage on analogy of blitzkrieg (q.v.), from German sitz "a sitting."[sitzkrieg etymology, sitzkrieg origin, 英语词源]