unmask one's batteries

English dictionary entry

Meanings

verb
  1. To begin a decisive action, especially one that reveals one’s true strength or character.
  2. Used other than figuratively or idiomatically: see unmask, battery.

Word forms

unmask one's batteries unmasks one's batteries unmasking one's batteries unmasked one's batteries

Etymology

From the revealing of artillery previously concealed from the enemy’s line of sight, immediately before opening fire.

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