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Definition of rat:

  1. A round and tapering mass of hair, or similar material, used by women to support the puffs and rolls of their natural hair.
  2. 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.
  3. One of several species of small rodents of the genus Mus and allied genera, larger than mice, that infest houses, stores, and ships, especially the Norway, or brown, rat ( M. decumanus), the black rat ( M. rattus), and the roof rat ( M. Alexandrinus). These were introduced into America from the Old World.
  4. One who deserts his party or associates; hence, in the trades, one who works for lower wages than those prescribed by a trades union.
  5. To catch or kill rats.

Synonyms:

betray, barf, clown, gage, bottom, cad, take a crap, keister, break, glom, lout, crud, slime, patronise, creep, whistle-blower, dirtbag, strikebreaker, reveal, brand, thieve, scum, rear end, double-dealer, can, vomit, rodent, patronize, smoke, stool pigeon, beast, cretin, derriere, sleuth, angora, tattler, shit, hindquarters, lowlife, blabber, approach, hook, stoolie, toad, crap, scuzzball, frequent, heel, ratfink, tail end, squealer, confess, seat, make, dope, hobo, recreant, nates, cuckold, squeal, bum, knock off, take a shit, posterior, deserter, sleazeball, give away, weed, shop at, blighter, loafer, sell, buns, fail, sens, rump, stool, two-timer, varmint, cur, divulge, law, stinkpot, spy, rotter, grass, rear, sleazebag, puke, bighorn sheep, betrayer, grass over, rat fink, lead astray, sponsor, turncoat, green goddess, discover, locoweed, do-nothing, git, deceive, talebearer, so-and-so, peach, snoop, sleaze, tooshie, muskrat, dirty dog, prat, traitor, tattletale, cheat on, anteater, snitcher, mark, familiar, slob, bewray, unwrap, snitch, badger, apostate, fifth column, grunter, vomitus, shutout, scab, vermin, stinkard, pill, canary, blackleg, cheat, louse, stigmatise, cop, tail, buy at, stigmatize, arse, deep throat, bleeder, skunk, fink, boor, stinker, joker, informant, hind end, wood pussy, knowledge, haunter, lemon, defector, sess, fundament, tramp, backside, expose, habitué, buzzard, let on, let out, double-crosser, scumbag, layabout, stag, regular, crumb, Judas, tergiversator, tell on, pest, musk turtle, bugger, nark, defecate, bounder, scum bag, disclose, schmuck, pot, tush, reptile, a snake in the grass, chuff, sod, churl, snake, ca-ca, butt, wander, renegade, stern, denounce, black bear, fanny, slimeball, idler, shop, tipster, trust, bastard, frequenter, runagate, bat, behind, informer, hound, buttocks, browse, bring out, telltale.

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