This is the 3429th most frequent Turkish word.
kırdı
"Broke" (past tense of "break").
In this sentence, 'kırdı' is a verb in past tense meaning 'he/she/it broke', referring to breaking a physical object.
O, düşürdüğü vazoyu kırdı.
He broke the vase he dropped.
Here, 'kırdı' conveys a figurative meaning, 'hurt', as in emotionally hurting someone.
Geçmişte ona söyledikleriyle kalbini kırdı.
He hurt her feelings with what he said to her in the past.
In this usage, 'kırdı' metaphorically describes 'shattering' or 'damaging' confidence or morale.