DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   cluck
       n 1: the sound made by a hen (as in calling her chicks) [syn:
            cluck, clucking]
       v 1: make a clucking sounds, characteristic of hens [syn:
            cluck, click, clack]