呜呼 is a classical Chinese exclamation expressing sorrow, regret, or lament — equivalent to 'alas' in English. It appears mainly in formal, literary, or historical contexts. In modern Chinese it can also function as a verb (婉辞, euphemism for 'to die') in fixed phrases like 一命呜呼, but this row covers only the interjection use. Use it at the start of a sentence before an emotional statement.