'Sǎo fū·rén' is a formal, respectful term used to address or refer to someone else's older brother's wife—never one's own. It literally combines 嫂 (sǎo), meaning 'elder brother's wife', with 夫人 (fū·rén), a polite title equivalent to 'Madam' or 'Mrs.'. The compound elevates the basic kinship term into a courteous, socially appropriate form suitable for introductions, letters, or face-to-face meetings in traditional or formal settings.

This term reflects Chinese cultural emphasis on hierarchical respect and relational precision: using it correctly signals awareness of family roles and social distance. It is not used casually among peers or in informal speech; instead, it appears in contexts like wedding invitations, formal letters, or when speaking to elders about their relatives. Unlike colloquial terms like 'dà gē tài tai' (big brother’s wife), 嫂夫人 carries dignified restraint and is never shortened or used with first names.