dunyoudaoicibaDictYouDict[dun 词源字典]
dun: English has two words dun. The colour adjective, ‘greyish brown’ [OE], comes ultimately from Indo-European *donnos, *dusnos, which is also the source of English dusk. The now rather dated noun, ‘debtcollector’ [17], is an abbreviation of dunkirk, a 17th-century term for a ‘privateer’, a privately owned vessel officially allowed to attack enemy shipping during wartime.

It was originally applied from such privateers that sailed from the port of Dunkirk, on the northern coast of France, to attack British ships, and its connotations of unwarranted piracy soon spread metaphorically to one who was constantly importuning for the repayment of his loan.
=> donkey, dusk, obfuscate[dun etymology, dun origin, 英语词源]
condominium (n.)youdaoicibaDictYouDict
c. 1714, "joint rule or sovereignty," from Modern Latin condominium "joint sovereignty," apparently coined in German c. 1700 from Latin com- "together" (see com-) + dominum "right of ownership" (see domain). A word in politics and international law until sense of "privately owned apartment" arose in American English 1962 as a special use of the legal term.