tā / dāng / zhe / dà / jiā / de / miàn / fā / shì / bú / zài / wéi / yuē / shì / bù / fǎn / huǐ

他当着大家的面发誓不再违约，誓不反悔。

He swore in front of everyone that he would never break the agreement and would not go back on his word.