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a pound to a penny

A British idiomatic expression meaning something is highly likely or virtually certain — equivalent to 'I'd bet anything.' The phrase draws on the imagery of offering heavily lopsided betting odds: if you stake a pound against someone else's penny, you're supremely confident in your position.

SilenthistoricalHistorical131 viewsLast reviewed Jun 29, 2026+ Add a definition
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UK
#1·Apr 28, 2026UK

A British idiomatic expression meaning something is highly likely or virtually certain — equivalent to 'I'd bet anything.' The phrase draws on the imagery of offering heavily lopsided betting odds: if you stake a pound against someone else's penny, you're supremely confident in your position. Used to assert strong certainty, typically in a conversational or informal register. More common in older British speech; younger speakers might use 'I'd bet my life on it' or similar.

A pound to a penny, he'll turn up late and blame the traffic.
Origin: From British betting culture, where one side of a wager could offer pound-to-penny odds to signal extreme confidence. The asymmetric stakes imply near-certainty. Editorial expansion authored on Slangora.
Cluster: intensifier
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UK
#2·Apr 28, 2026UK

A British idiom expressing high confidence that something is true or likely to happen, essentially saying you would bet a pound against just a penny, meaning the odds are overwhelmingly in favor. Used to emphasize certainty about a prediction or claim. More colorful than simply saying almost certainly but functionally equivalent. The asymmetric financial metaphor makes the confidence tangible and specific.

It's a pound to a penny she already knows about the surprise party — she knows everything.
Origin: From the asymmetric bet: staking a pound (high value) against a penny (low value) expresses overwhelming confidence in the outcome. Editorial expansion authored on Slangora.
For parents

A pound to a penny means: A British idiom expressing high confidence that something is true or likely to happen, essentially saying you would bet a pound against just a penny, meaning the odds are overwhelmingly in favor.. There is no real cause for parental concern; it is descriptive vocabulary rather than risky behaviour. If your teen uses it, context will usually make the intent clear. A short, curious question about where they heard it is usually all that is needed to know whether to follow up.

For ESL learners

a pound to a penny means: A British idiom expressing high confidence that something is true or likely to happen, essentially saying you would bet a pound against just a penny, meaning the odds are. Register: neutral, standard English. Common learner mistake is using the word in a register it does not fit, or assuming a single global meaning; always check the context before producing it yourself.

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UK
#3·Apr 27, 2026UK

(UK, idiomatic) Very likely; almost certainly.

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