HSK 7-9
发誓
fāshì动
to vow; to pledge; to swear
他发誓不再隐瞒事实。
Tā fā shì bú zài yǐn mán shì shí.
He swore never to conceal the facts again.
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Appears across levels (7-9) in the HSK 3.0 word list.