信誓旦旦

Origin and story

The Book of Songs poem 'Meng,' in the Airs of Wei, gives voice to a woman looking back on a relationship that has betrayed her hopes. She recalls youthful happiness, easy laughter, and solemn assurances, then confronts the painful distance between those vows and what followed. The expression appears in this remembered contrast, not in an uncomplicated celebration of promises kept.

旦旦 describes an earnest, convincing manner. The phrase therefore tells us how firmly a promise is expressed, not whether the speaker will fulfill it. Modern speakers often preserve the poem's irony when they recall someone's confident assurance after events prove otherwise.