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From: DICT.TW English-Chinese Dictionary 英漢字典

 rat /ˈræt/

From: Webster's Revised Unabridged Dictionary (1913)

 Rat n.
 1. Zool. One of several species of small rodents of the genus Rattus (formerly included in Mus) and allied genera, of the family Muridae, distinguished from mice primarily by being larger.  They infest houses, stores, and ships, especially the Norway rat, also called brown rat, (Rattus norvegicus formerly Mus decumanus), the black rat (Rattus rattus formerly Mus rattus), and the roof rat (formerly Mus Alexandrinus, now included in Rattus rattus). These were introduced into America from the Old World.  The white rat used most commonly in laboratories is primarily a strain derived from Rattus rattus.
 2. A round and tapering mass of hair, or similar material, used by women to support the puffs and rolls of their natural hair. [Local, U.S.]
 3. One who deserts his party or associates; hence, in the trades, one who works for lower wages than those prescribed by a trades union. [Cant]
 Note:“It so chanced that, not long after the accession of the house of Hanover, some of the brown, that is the German or Norway, rats, were first brought over to this country (in some timber as is said); and being much stronger than the black, or, till then, the common, rats, they in many places quite extirpated the latter. The word (both the noun and the verb to rat) was first, as we have seen, leveled at the converts to the government of George the First, but has by degrees obtained a wider meaning, and come to be applied to any sudden and mercenary change in politics.”
 Bamboo rat Zool., any Indian rodent of the genus Rhizomys.
 Beaver rat, Coast rat. Zool. See under Beaver and Coast.
 Blind rat Zool., the mole rat.
 Cotton rat Zool., a long-haired rat (Sigmodon hispidus), native of the Southern United States and Mexico. It makes its nest of cotton and is often injurious to the crop.
 Ground rat. See Ground Pig, under Ground.
 Hedgehog rat. See under Hedgehog.
 Kangaroo rat Zool., the potoroo.
 Norway rat Zool., the common brown rat. See Rat.
 Pouched rat. Zool. (a) See Pocket Gopher, under Pocket. (b) Any African rodent of the genus Cricetomys. Rat Indians Ethnol., a tribe of Indians dwelling near Fort Ukon, Alaska.  They belong to the Athabascan stock.
 Rat mole. Zool. See Mole rat, under Mole.
 Rat pit, an inclosed space into which rats are put to be killed by a dog for sport.
 Rat snake Zool., a large colubrine snake (Ptyas mucosus) very common in India and Ceylon.  It enters dwellings, and destroys rats, chickens, etc.
 Spiny rat Zool., any South American rodent of the genus Echinomys.
 To smell a rat. See under Smell.
 Wood rat Zool., any American rat of the genus Neotoma, especially Neotoma Floridana, common in the Southern United States. Its feet and belly are white.

From: Webster's Revised Unabridged Dictionary (1913)

 Rat, v. i. [imp. & p. p. Ratted; p. pr. & vb. n. Ratting.]
 1. In English politics, to desert one's party from interested motives; to forsake one's associates for one's own advantage; in the trades, to work for less wages, or on other conditions, than those established by a trades union.
    Coleridge . . . incurred the reproach of having ratted, solely by his inability to follow the friends of his early days.   --De Quincey.
 2. To catch or kill rats.

From: WordNet (r) 2.0

      n 1: any of various long-tailed rodents similar to but larger
           than a mouse
      2: someone who works (or provides workers) during a strike
         [syn: scab, strikebreaker, blackleg]
      3: a person who is deemed to be despicable or contemptible;
         "only a rotter would do that"; "kill the rat"; "throw the
         bum out"; "you cowardly little pukes!"; "the British call
         a contemptible person a `git'" [syn: rotter, dirty dog,
          skunk, stinker, stinkpot, bum, puke, crumb, lowlife,
          scum bag, so-and-so, git]
      4: one who reveals confidential information in return for money
         [syn: informer, betrayer, squealer, blabber]
      5: a pad (usually made of hair) worn as part of a woman's
      v 1: desert one's party or group of friends, for example, for
           one's personal advantage
      2: employ scabs or strike breakers in
      3: take the place of work of someone on strike [syn: scab, blackleg]
      4: give (hair) the appearance of being fuller by using a rat
      5: catch rats, especially with dogs
      6: give away information about somebody; "He told on his
         classmate who had cheated on the exam" [syn: denounce, tell
         on, betray, give away, grass, shit, shop, snitch,
      [also: ratting, ratted]