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A Kibitzer is a Yiddish term for a spectator, usually one who offers (often unwanted) advice or commentary. The term can be applied to any activity, but is most commonly used to describe spectators in games such as contract bridge, chess and Schafkopf.
In bridge, a kibitzer simply refers to a spectator watching a player's hand; kibitzers in bridge are expected to remain silent and not impact the game.
The verb kibitz can also refer to idle chatting or side conversations.
In computer science the term is the title of a programming language released by NIST, as a sub-project of the Expect programming language, that allows two users to share one shell session, taking turns typing one after another.
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