Where does the saying lost your bottle originate?

The saying "lost your bottle" originates from British slang, specifically among Londoners. It refers to losing one's courage or resolve in a challenging situation, akin to being too afraid to face something head-on. The term "bottle" is believed to be derived from the Cockney rhyming slang "bottle and glass," which rhymes with "arse," implying a loss of nerve or bravery. Over time, it has become a colloquial expression for cowardice or lack of confidence.