This is the 13765th most frequent Turkish word.
kırılır
"Breaks" or "is broken."
In this sentence, 'kırılır' indicates a passive action of breaking, suggesting what happens to the glass spontaneously.
Eğer bardağa dikkat etmezsen, kırılır.
If you don't pay attention to the glass, it will break.
Here, 'kırılır' metaphorically refers to emotional breaking or heartbreak, illustrating a figurative use of the word.
Kalp kırılır ama onarılabilir.
Hearts break but they can be mended.
In this usage, 'kırılır' describes the natural consequence of a condition occurring, namely the breaking of glass due to impact.