吃了定心丸

to feel reassured

to eat / to consume / to eat at (a cafeteria etc) / to eradicate / to destroy / to absorb / to suffer / to stammer (Taiwan pr. for this sense is [ji2])

variant of 吃[chi1]

(completed action marker) / (modal particle indicating change of state, situation now) / (modal particle intensifying preceding clause)

to finish / to achieve / variant of 瞭|了[liao3] / to understand clearly

(of eyes) bright / clear-sighted / to understand clearly

unofficial variant of 瞭[liao4]

to set / to fix / to determine / to decide / to order

heart / mind / intention / center / core / CL:顆|颗[ke1],個|个[ge4]

tranquilizer / sth that sets one's mind at ease

ball / pellet / pill