Kibitzer

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, Go, and Schafkopf.

In computer science the term is the title of a programming language[2] 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.

There is a 1930 film called The Kibitzer[3] which is based on the 1929 three-act comedy play by the same name.

[4] Jane Jacobs describes a kibitzer as someone who keeps a look-out on a street, and seeing suspicious activity, intervenes to help the victim.