Noun clack has 2 senses
  1. clack, clap - a sharp abrupt noise as if two objects hit together; may be repeated
    --1 is a kind of noise
    Derived forms: verb clack1, verb clack2
  2. clack valve, clack, clapper valve - a simple valve with a hinge on one side; allows fluid to flow in only one direction
    --2 is a kind of valve
,Verb clack has 3 senses
  1. clatter, clack, brattle - make a rattling sound; "clattering dishes"
    --1 is one way to make noise, resound, noise
    Derived form: noun clack1
    Sample sentences:
    Cars clack in the streets
    The streets clack with cars
  2. cluck, click, clack - make a clucking sounds, characteristic of hens
    --2 is one way to utter, emit, let out, let loose
    Derived form: noun clack1
    Sample sentences:
    Something ----s
    Somebody ----s
  3. chatter, piffle, palaver, prate, tittle-tattle, twaddle, clack, maunder, prattle, blab, gibber, tattle, blabber, gabble - speak (about unimportant matters) rapidly and incessantly
    --3 is one way to talk, speak, utter, mouth, verbalize, verbalise
    Sample sentence:
    Somebody ----s
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