close ranks

/K L OW1 S R AE0 NG K S/
verb
  1. 1

    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.

  2. 2

    To maintain silence and secrecy in the face of some external threat.

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Source: https://en.wiktionary.org/wiki/close%20ranks