Meaning of "backseat driver"

[Dolores]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #68 "Back Again", question 4

He's having trouble with his mother-in-law because she likes to control everything rather like a backseat ..........

(a) conductor
(b) driver
(c) doer
(d) goer

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #68 "Back Again", answer 4

He's having trouble with his mother-in-law because she likes to control everything rather like a backseat driver.

Correct answer: (b) driver
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dear teacher can u explaine to me what it mean?

Dolores

[Yankee]

Hi

A backseat driver is an annoying passenger in a car who is criticizing the driver or telling the driver what to do --- although the driver is probably driving just fine. ;)

Amy
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"Nearly all men can stand adversity, but if you want to test a man's character, give him power." ~ Abraham Lincoln