Noun rat has 5 senses
  1. rat - any of various long-tailed rodents similar to but larger than a mouse
    --1 is a kind of
    rodent, gnawer, gnawing animal
    --1 has particulars:
     pocket rat; brown rat, Norway rat, Rattus norvegicus; black rat, roof rat, Rattus rattus; bandicoot rat, mole rat; jerboa rat; rice rat, Oryzomys palustris
    Derived form: verb rat5
  2. scab, strikebreaker, blackleg, rat - someone who works (or provides workers) during a strike
    --2 is a kind of worker
    Derived forms: verb rat3, verb rat2
  3. rotter, dirty dog, rat, skunk, stinker, stinkpot, bum, puke, crumb, lowlife, scum bag, so-and-so, git - 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'"
    --3 is a kind of unpleasant person, disagreeable person
    Derived form: verb rat1
  4. informer, betrayer, rat, squealer, blabber - one who reveals confidential information in return for money
    --4 is a kind of informant, source
    --4 has particulars:
     fink, snitch, snitcher, stoolpigeon, stoolie, sneak, sneaker, canary; nark, copper's nark; supergrass
    Derived form: verb rat6
  5. rat - a pad (usually made of hair) worn as part of a woman's coiffure
    --5 is a kind of
    --5 is a part of hairdo, hair style, coiffure
    Derived form: verb rat4
,Verb rat has 6 senses
  1. rat - desert one's party or group of friends, for example, for one's personal advantage
    --1 is one way to
    defect, desert
    Derived forms: noun rat3, noun ratter1
    Sample sentences:
    Somebody ----s something
    Somebody ----s somebody
  2. rat - employ scabs or strike breakers in
    --2 is one way to
    hire, engage, employ
    Derived forms: noun rat2, noun ratter1
    Sample sentence:
    Somebody ----s something
  3. scab, rat, blackleg - take the place of work of someone on strike
    --3 is one way to work, do work
    Derived forms: noun rat2, noun ratter1
    Sample sentence:
    Somebody ----s
  4. rat - give (hair) the appearance of being fuller by using a rat
    --4 is one way to
    pad, fill out
    Derived form: noun rat5
    Sample sentence:
    Somebody ----s something
  5. rat - catch rats, especially with dogs
    --5 is one way to
    capture, catch
    Derived forms: noun rat1, noun ratter2
    Sample sentence:
    Somebody ----s
  6. denounce, tell on, betray, give away, rat, grass, shit, shop, snitch, stag - give away information about somebody; "He told on his classmate who had cheated on the exam"
    --6 is one way to inform
    Derived forms: noun rat4, noun ratter1, noun ratting1
    Sample sentences:
    Somebody ----s somebody
    => Somebody ----s PP