passe-partout (n.)youdaoicibaDictYouDict[passe-partout 词源字典]
"master-key," 1670s, French, literally "pass everywhere," from passer "to pass" (see pass (v.)) + partout "everywhere," from par "through" (see per) + tout "all."[passe-partout etymology, passe-partout origin, 英语词源]