Verb (1-dan, intransitive)
1. to break (into pieces); to be broken; to be smashed
ガラスが砕けたような音が響いた。A sound like glass shattering echoed.
2. to collapse; to crumble; to decline; to cool (e.g. enthusiasm); to dampen (e.g. one's will to fight)
だが、心が砕ける可能性もあるんだ。But there's also a chance your spirit will break.
3. to become less formal; to throw off reserve; to become affable
今の感じより、もう少し砕けてもいいかな。I think it might be okay to be a little more casual than the current feel.
4. to become easy to understand (e.g. a story)
5. to be worried