This research delves into the pragmatic function of euphemisms in the context of the American sitcom The Big Bang Theory, utilizing Conceptual Blending Theory (CBT) as the analytical framework. The purpose is to understand how euphemisms, as a form of polite language, are constructed to avoid direct and potentially offensive expressions, thus promoting social harmony. The methodology involves a detailed analysis of euphemistic language within the sitcom, focusing on the integration of mental spaces as proposed by CBT. The study identifies key euphemisms and constructs a conceptual integration network for each, revealing the input spaces, generic space, and the blended space that emerges, offering new meanings. The main results demonstrate that euphemisms are cognitively processed through the blending of spaces, where elements from different domains combine to form a less confrontational meaning. The conclusion underscores the efficacy of CBT in explaining the complexity of euphemistic language, showcasing its role in navigating social norms and cultural sensitivities. This research provides insights into American cultural nuances and the strategic use of language in social interactions, enhancing the understanding of euphemisms as a cross-cultural communication tool.