close ranks

verb3

1. •
   To close the spacing between lines (ranks) of troops, as they are deployed across a battlefield, thereby decreasing the depth of the formation as it faces the enemy side.
2. •
   (figurative) To regroup forces, especially when this involves overlooking differences in order to face a challenge or adverse situation. Often implies making a show of unity, especially to the public.
3. •
   (figurative) To maintain silence and secrecy in the face of some external threat.

   • However, the charges that the police closed ranks to protect Godber find a parallel in Wong's hearings. — 2007