# go off half-cocked

idiom

Source: https://englishreference.com/idiom/go-off-half-cocked
Updated: 2026-08-10

## Meaning

To take a premature or ill-considered action.

## Examples

- Don't go off half-cocked without checking the facts first.
- He decided to quit his job and move abroad, but his friends warned him not to go off half-cocked without a plan.
- The committee urged the director to wait for the full report rather than going off half-cocked and making a decision that could damage the company's reputation.

## Origin

The phrase is widely said to derive from the mechanics of flintlock and caplock firearms, in which the hammer could be set to a half-cock position. This setting served as a rudimentary safety and was the required state for priming the pan or inserting a percussion cap. Originally rendered as "to go off at half-cock," the idiom describes the mechanical failure of a weapon discharging before the hammer has been fully drawn back to the firing position. An alternative, though disputed, theory traces the expression to archery. In this context, the cock refers to the uniquely coloured feather on an arrow which must be aligned correctly before the bow is fully drawn. To go off half-cocked would suggest releasing the arrow before reaching full draw, resulting in a shot that lacks the power necessary to reach its target. (disputed)

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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.