发誓 (fā shì) — to swear, to vow, to pledge (a solemn promise)

Definition

发誓 is a solemn, personal vow or oath (often invoking heaven or one's honor), stronger than 保证 ('guarantee') and 承诺 ('promise'), which can be everyday. 宣誓 is more formal, typically a public/ceremonial oath (e.g., office-taking).

verb
to swearto vowto pledge (a solemn promise)

Examples

  • 发誓
    Tā dāng zhe dà jiā de miàn fā shì yào nǔ lì gōng zuò.
    He vowed in front of everyone to work hard.
  • Wǒ cóng wèi fā guò zhè yàng de shì.
    I have never made such a vow.
  • 发誓
    Tā duì tiān fā shì zì jǐ jué bú huì shuō huǎng.
    She swore to heaven that she would never lie.

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