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Noun: back-seat driver
Usage: informal
  1. A passenger in a car who gives the driver unwanted advice
    "His constant comments made him an annoying back-seat driver";
    - backseat driver [informal]
     
  2. A meddler who insists on giving unwanted advice
    "His constant comments made him an annoying back-seat driver during the road trip";
    - backseat driver [informal]

Derived forms: backseat drivers, back-seat drivers

Type of: meddler

Encyclopedia: Back-seat driver