‘夸口’ is a verb meaning ‘to brag’ or ‘to make bold, boastful claims,’ often about one’s abilities, possessions, or achievements. The character 夸 (kuā) means ‘to praise’ or ‘to exaggerate,’ while 口 (kǒu) means ‘mouth’—together, they literally suggest ‘speaking boastfully.’ It carries a slightly negative connotation, implying the speaker is overstating facts, sometimes to impress others or mask insecurity.

This word is commonly used in spoken and written Chinese to describe unverified or exaggerated self-praise. It often appears in contexts involving promises, challenges, or comparisons—especially when someone confidently asserts something beyond reasonable expectation. Unlike neutral terms like ‘说’ (say), ‘夸口’ implies unreliability or lack of evidence behind the statement, and is frequently followed by clauses introduced by ‘说’ or ‘要’ (e.g., 夸口说…, 夸口要…). It’s more formal than colloquial slang like ‘吹牛’ but less literary than ‘自诩.’