fall in line

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fall in line

1. (idiomatic) To submit to the rules of a higher authority; obey; conform.
   • 1901, Anna Maynard Barbour, chapter 18, in That Mainwaring Affair:

     It will be to your interest to accept my suggestions and fall in line with my plans.

   • c. 2004, Career Soldiers, "Won't Waste My Life":

     If I had your life I'd put my throat to a knife,

     Fill your days with emptiness, but I don't have the time;

     I won't grow up, I won't fall in line.

• knuckle under

• toe the line