‘Shìyán’ (誓言) means ‘oath’ or ‘vow’—a solemn, binding promise often made in serious or emotional contexts. The character 誓 (shì) conveys the idea of a firm, unbreakable commitment, historically linked to oaths taken before deities or authorities; 言 (yán) means ‘speech’ or ‘words’, emphasizing that this promise is spoken and intentional. Together, they signify words spoken with deep sincerity and moral weight.

This word appears frequently in formal, literary, or emotionally charged settings—such as wedding ceremonies, legal affirmations, or personal pledges of loyalty or change. Unlike casual promises (e.g., 承诺 chéngnuò), 誓言 carries gravity and moral obligation; breaking one is seen as deeply dishonorable. It’s rarely used in everyday small-talk but common in speeches, literature, films, and historical narratives where integrity, duty, or love is central.