To crunch or masticate: to bite and break something into pieces; to chew thoroughly.
彼はクッキーを力強く噛み砕いた。
He forcefully bit and crunched the cookie.
固い種を噛み砕く必要はない。
There is no need to crush hard seeds by chewing them.
飴を噛み砕くと歯が痛くなることがある。
Crushing candy with your teeth can sometimes hurt them.
To break down or simplify: to explain something difficult in plain, easy-to-understand terms.
先生は専門用語を噛み砕いて説明してくれた。
The teacher broke down the technical terms and explained them to us.
記事は難しい理論を噛み砕いて書かれている。
The article is written to simplify a difficult theory.
顧客向けに仕様書の内容を噛み砕いて説明した。
I explained the specifications to the client in simplified terms.