1. a passenger in a car who continuously tells the driver how they should drive.

Mike's a real backseat driver and I find it so irritating.

2. someone who expects to control things although it is not their responsibility to do this.

Tell her you're in charge now. It's time she stopped being a backseat driver.

• put someone through their paces
• put someone through the mill
• put someone through the wringer
• put someone to death
• put someone to shame
• put someone to sleep
• put someone to the test
• put something back on the rails
• put something back on track
• put something behind
• put something behind someone
• put something behind something
• put something behind you
• put something down to experience
• put something in a hole
• put something in motion
• put something in the shade
• put something into service
• put something on a pedestal
• put something on hold
• put something on ice
• put something on the back burner
• put something on the line
• albatross around your neck
• albatross round neck