his (sharaq): "To hiss" has two applications: (1) to call, (2) to express contempt or scorn.
⇒See the definition of hiss in the KJV Dictionary
(1) It is the translation of sharaq, a mimetic word meaning to hiss or whistle, to call (bees, etc.), (a) Isa 5:26, "I will hiss unto them from the ends ...