Definitions for backseat driver
Random House Webster's College Dictionary
an automobile passenger who offers the driver unsolicited advice or criticism.
any meddlesome person who offers unsolicited advice.
Origin of backseat driver:
a meddler who insists on giving unwanted advice
A passenger in a car who insists on giving the driver directions.
By extension, anybody offering unsolicited or unwelcome advice.
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"backseat driver." Definitions.net. STANDS4 LLC, 2013. Web. 23 May 2013. <http://www.definitions.net/definition/backseat driver>.