HSK 7-9
定心丸
dìngxīnwán名
tranquilizer; sth that sets one's mind at ease
经理的承诺让大家吃了定心丸。
Jīng lǐ de chéng nuò ràng dà jiā chī le dìng xīn wán.
The manager's promise put everyone's mind at ease.
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Appears across levels (7-9) in the HSK 3.0 word list.