gang (n.)youdaoicibaDictYouDict[gang 词源字典]
from Old English gang "a going, journey, way, passage," and Old Norse gangr "a group of men, a set," both from Proto-Germanic *gangaz (cognates: Old Saxon, Old Frisian, Danish, Dutch, Old High German, German gang, Old Norse gangr, Gothic gagg "act of going"), from PIE root *ghengh- "to step" (cognates: Sanskrit jangha "shank," Avestan zanga- "ankle," Lithuanian zengiu "I stride"). Thus not considered to be related to go.

The sense evolution is probably via meaning "a set of articles that usually are taken together in going" (mid-14c.), especially a set of tools used on the same job. By 1620s this had been extended in nautical speech to mean "a company of workmen," and by 1630s the word was being used, with disapproving overtones, for "any band of persons traveling together," then "a criminal gang or company" (gang of thieves, gang of roughs, etc.). By 1855 gang was being used in the sense "group of criminal or mischievous boys in a city." In American English, especially of slaves working on plantations (1724). Also formerly used of animal herds or flocks (17c.-19c.). Gangway preserves the original sense of the word, as does gangplank.[gang etymology, gang origin, 英语词源]
gang-plank (n.)youdaoicibaDictYouDict
also gangplank, 1842, American English, from gang in its nautical sense of "a path for walking, passage" (see gangway) + plank. Replacing earlier gang-board.
MunichyoudaoicibaDictYouDict
Bavarian capital, German München, from root of Mönch "monk" (see monk); founded 1158 as a market town by Benedictine monks. In allusions to "appeasement" it is from the meeting of German, British, French and Italian representatives there in Sept. 29, 1938, which resulted in the cession of Sudetenland to Germany in exchange for Hitler's pledges.
During the flight Daladier sat silent and morose, worried about the reception he would receive at Le Bourget, about how the French would react to his having betrayed Czechoslovakia and France's promises. As the plane circled for landing, he and others saw a massive crowd awaiting them. Expecting jeers, hisses, rotten fruit, and maybe worse, Daladier declared stolidly: 'They are going to mob me, I suppose. ... I appreciate their feelings,' and insisted on absorbing their wrath by being the first off the plane. But as he stood dumbfounded on the gangplank, thousands surged forward carrying flags and flowers, shouting 'Hurrah for France! Hurrah for England! Hurrah for peace!' Daladier turned back to Léger and cursed, 'The God-damned fools!' [Benjamin F. Martin, "France in 1938"]