back-seat driver

backseat driver

noun
1.
an automobile passenger who offers the driver unsolicited advice, warnings, criticism, etc., especially from the backseat.
2.
any person who, by means of criticism, unsolicited advice, or the like, interferes in affairs that are not his or her concern or responsibility.

Origin:
1925–30

backseat driving, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
back-seat driver
 
n
1.  a passenger in a car who offers unwanted advice to the driver
2.  a person who offers advice on or tries to direct matters that are not his or her concern

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