bet one's bottom dollar

(US, slang, sometimes considered, _, vulgar) To bet everything; to have total reliance or confidence in something.

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 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.

(chiefly, US, countrified, idiomatic) Assuredly, absolutely, utterly, completely, you bet.

(slang, often, _, jocular) A unit of currency.