Backseat driver
Meaning
Someone who offers unwanted advice during another's efforts.
Usage
Used when critics unnecessarily direct others.
Origin & History
Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.
Automobile passenger giving driving tips from the backseat.
Appeared mid-20th century with the rise of car travel.