This is the 10263rd most frequent Japanese word.
震える
"To tremble" or "to shake."
In this context, "震える" is applied to the shaking of one's voice caused by fear or emotional distress.
恐怖で声が震えるのを抑えられなかった。
I couldn't stop my voice from trembling with fear.
This usage of "震える" metaphorically represents the trembling or profound impact felt emotionally.
感動して心が震えることがある。
Sometimes my heart trembles with emotion.
Here, the word "震える" is used to describe the physical act of shaking due to cold temperatures.