to set
heart
pill
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→ding4xin1wan2 • dìngxīnwán
calming pill
chill pill, assurance
This word is nearly always used figuratively, like the English word "chill pill". However, it is slightly different insofar that it is said in a more earnest fashion.
这 句话 就 像 一 颗 定心丸。
That sentence is like a calming pill.
她 的 笑容 就 像 一 颗 定心丸。
Her smile is like a calming pill.
你 的 回答 给 我 一 颗 定心丸。
Your answer gave me a calming pill (of reassurance).