fathom

Definition

To understand the meaning of something, especially something difficult; also, a unit of length equal to six feet, used in measuring depth of water.

中文 理解某事物的含义，特别是困难的事物；也是一种长度单位，等于六英尺，用于测量水的深度。

Example

"I can't fathom why she would say such a thing."