back seat driving

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
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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