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Found one definition

1.                 From English-Hindi FreeDict Dictionary ver. 1.6:
                   
   
   
                   
                     
   plunk /plˈʌŋk/ <N>
   1. झनकने की आवाज़
         "At the night the man heard the plunk but was unable to see what it is."
   2. सस्ती शराब
         "The poor people can afford plunk only."