fathom
noun [ C ] uk/ˈfæð.əm/ us/ˈfæð.əm/
英寻（测量水深单位，合1.8米或6英尺）
a unit for measuring the depth of water, equal to 1.8 metres or 6 feet
fathom
verb [ T ] uk/ˈfæð.əm/ us/ˈfæð.əm/
UK弄清;理解
to discover the meaning of something
For years people have been trying to fathom (out) the mysteries of the whale's song. 多年来人们一直试图弄清鲸鱼歌声之谜。
了解;明白
to understand someone or why someone acts as they do
I can't fathom her at all. 我一点儿也搞不懂她。