kibitzer

/ˈkɪbɪtsər/
noun
  1. A person who gives unwanted advice or comments, especially while watching others do something.
    • The office kibitzer kept interrupting our meeting with unsolicited opinions.
    • The old man was a kibitzer, always telling the chess players what moves to make.
    • My uncle is a friendly kibitzer who can't help shouting suggestions during baseball games.
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