Definition of "whisht"

whisht

interjection
1. (Ireland; Britain, especially Scotland, Northumbria) Shush, silence, be quiet!
  Quotations
  “You must have loved him very much,” she said.“Whisht,” said the old woman, “there’s a word that you must never use until there's marrying between you […] ”
  1952, Neville Shute, chapter 9, in The Far Country‎, London: Heinemann
2. A sound often used to calm livestock, cattle, sheep etc.