# poacher turned gamekeeper

idiom

Source: https://englishreference.com/idiom/poacher-turned-gamekeeper
Updated: 2026-08-10

## Meaning

A person now charged with protecting what they formerly preyed upon.

## Examples

- The former thief is now a security guard, a real poacher turned gamekeeper.
- After years of hacking into company servers, he now works in cybersecurity, a classic case of a poacher turned gamekeeper.
- The regulator, once a notorious corporate lobbyist, exemplifies the poacher turned gamekeeper, now enforcing the very laws he previously spent his career dismantling.

## Origin

The figurative sense is a self-evident metaphor from the literal occupation. The notion that those who once hunted illegally are best suited to guard the land has circulated for centuries, appearing in various forms as an observation on the utility of an inside perspective. William Tinsley recorded the sentiment in his memoirs, noting the old saying that the most expert poachers make the best gamekeepers. Tinsley himself remained unconvinced of the logic, observing that he did not think the saying was true as a rule. Despite his scepticism, the phrase persisted as a shorthand for the shift from subverting a system to maintaining it.

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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.