1. interjection. Used to express disappointment or sympathy. (a t-like sound produced by suction rather than plosion)
  2. noun. A brief, tight sucking noise made by suddenly releasing the tongue from the hard palate directly behind the front teeth, used to express disappointment or sympathy.
  3. informal. The sound I repeatedly made while reading your soft linked node.
Source: The American Heritage Dictionary of the English Language, Third Edition. Use permitted by applicable laws.

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