back-seat driver

noun
🔊/ˌbæk siːt ˈdraɪvə(r)/
🔊/ˌbæk siːt ˈdraɪvər/
(disapproving)
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  1. a passenger in a vehicle who keeps giving advice to the driver about how he or she should drive对驾驶者指手画脚的乘客Topics Transport by car or lorryc2
  2. a person who wants to be in control of something that is not really their responsibility企图越权者