# unmask one's batteries

idiom

Source: https://englishreference.com/idiom/unmask-ones-batteries
Updated: 2026-08-10

## Meaning

To begin a decisive action, especially one that reveals one’s true strength or character.

## Examples

- He finally unmasked his batteries and showed everyone his true skills.
- She unmasks her batteries when she starts the difficult negotiation.
- You unmask your batteries once you show your real power.
- During the final debate, the candidate unmasked his batteries and presented a bold plan that surprised his opponents.
- The quiet lawyer unmasked her batteries during the cross-examination, proving she was far more aggressive than the witness expected.
- After pretending to be a beginner, the chess player unmasked his batteries by winning the tournament in ten moves.
- After months of careful preparation, the general finally unmasked his batteries, launching a decisive offensive that completely changed the course of the war.

## Origin

Derived from the military manoeuvre of revealing artillery pieces previously concealed from the enemy's line of sight. The batteries were kept hidden until the precise moment before opening fire, at which point the masking cover was removed to allow the engagement to begin.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.