backseat driver
US /ˈbæk.siːt ˌdraɪ.vər/
UK /ˈbæk.siːt ˌdraɪ.vər/
1.
a passenger in a car who gives unwanted advice to the driver
:
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My mom is such a backseat driver, always telling me how to merge.
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He gets annoyed when his wife acts like a backseat driver.
2.
a person who criticizes or gives unwanted advice about something they are not directly involved in
:
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The politician accused the media of being backseat drivers, offering criticism without solutions.
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Don't be a backseat driver in my life; I can make my own decisions.