n. 鼠；卑鄙小人，叛徒
vi. 捕鼠；背叛，告密
n. (Rat)人名；(法、意、印、瑞典)拉特；(泰)叻
老鼠来自中古英语 rat,老鼠，来自古英语 raet,老鼠，来自 Proto-Germanic*ratto,刮，咬，来自 PIE*red, 刮，咬，词源同 rodent,eraser.
rat: [OE] Rat is a general western European term, with relatives in French rat, Italian ratto, Spanish rata, German ratte, Dutch rat, Swedish r?atta, and Danish rotte. These all come from Vulgar Latin *rattus, whose origin is unknown.late Old English raet "rat," of uncertain origin. Similar words are found in Celtic (Gaelic radan), Romanic (Italian ratto, Spanish rata, French rat) and Germanic (Old Saxon ratta; Dutch rat; German Ratte, dialectal Ratz; Swedish r?tta, Danish rotte) languages, but connection is uncertain and origin unknown. In all this it is very much like .
 
 Perhaps from Vulgar Latin *rattus, but Weekley thinks this is of Germanic origin, "the animal having come from the East with the race-migrations" and the word passing thence to the Romanic languages. American Heritage and Tucker connect Old English raet to Latin rodere and thus PIE *red- "to scrape, scratch, gnaw," source of
(q.v.). Klein says there is no such connection and suggests a possible cognate in Greek rhine "file, rasp." Weekley connects them with a question mark and Barnhart writes, "the relationship to each other of the Germanic, Romance, and Celtic words for rat is uncertain." OED says "probable" the rat word spread from Germanic to Romanic, but takes no position on ultimate origin.
 
 RATS. Of these there are the following kinds: a black rat and a grey rat, a py-rat and a cu-rat. ["Dictionary of the Vulgar Tongue," Grose, 1788]
 
 Middle English common form was ratton, from augmented Old French form raton. Sense of "one who abandons his associates" (1620s) is from belief that rats leave a ship about to sink or a house about to fall and led to meaning "traitor, informant" (1902; verb 1910). Interjection rats is American English, 1886. To smell a rat is 1540s; "to be put on the watch by suspicion as the cat b to suspect danger" [Johnson]. _____-rat, "person who frequents _____" (in earliest reference dock-rat) is from 1864.1812, "to desert one' 1864 as "" 1910 as "to peach on, inform on, behav" from
(n.). Related: Ratted; ratting.
1. If I don't send a picture, he will smell a rat.
如果我不寄出照片，他将有所察觉。 来自柯林斯例句 2. They were accused of encouraging children to rat on their parents.
他们被指控唆使儿童告发自己的父母。 来自柯林斯例句 3. The brown rat has prominent ears and a long scaly tail.
那只棕鼠两只耳朵向前支着，一条长尾巴布满鳞片。 来自柯林斯例句 4. Captain Hardnose certainly ran that rat over the hill.
哈得诺思上尉当然要求那个告密者离职了. 来自《简明英汉词典》 5. The lab assistant injected the rat with the new drug.
实验室助手给老鼠注射了那种新药. 来自《简明英汉词典》有没有一些短的单词(英语)比如rat,cat,map这些,
red bag dad mom blue hat lap
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