sabre-rattling

/S EY1 B ER0 R AE1 T L IH0 NG/
verb
  1. 1

    To threaten a big battle or war.

noun
  1. 1

    A flamboyant display of military power as an implied threat that it might be used.

  2. 2

    Any threat, such as one company threatening another with a lawsuit.

adjective
  1. 1

    Bellicose; threatening military action.

Source: https://en.wiktionary.org/wiki/sabre-rattle, https://en.wiktionary.org/wiki/sabre-rattling