宣誓 (xuānshì) is an HSK 7-9 Chinese word. Its most common English meaning is to swear an oath (of office); depending on context, it can also mean to make a vow. Read the examples below to choose the meaning that fits the sentence.
01to swear an oath (of office)
02to make a vow
02 · EXAMPLES
宣誓
骑士宣誓效忠于国王。Qí shì xuān shì xiào zhōng yú guó wáng。
The knight swore an oath of allegiance to the king.