close ranks

Etymology:

• Derived from the military practice of closing the spacing between lines of troops, as they are deployed across a battlefield, thereby decreasing the depth of the formation as it faces the enemy side. This practice allowed for the second rank to fire their weapons without movement, sidestepping, and firing alongside, and slightly to the rear of the first rank. The opposite would be to open ranks. The columnar equivalent when not deployed for battle would be to close or extend the column.