Thus, the deep six is the deepest fathom... the final six feet at the bottom of the ocean.

因此，deep six是指最深的英寻，也就是说海洋底部最后6英尺。

youdao

Even now the snow along the roadside was five or six feet deep in places.

即使现在，路边的雪有的地方有五六英尺深。

《柯林斯英汉双解大词典》

At the base of a deep shaft six metres below the modern streets a wooden structure was revealed.

在现代街道下方六米深的竖井底部，有一座木质结构的建筑露出来了。

youdao

Thus,the deep six is the deepest fathom.

VOA: special.2009.05.24

I mean, isn't it somewhat inefficient to load it really deep, because I assume if a spear is only six feet long, what are people in the back going to be doing?

我觉得,过于厚实的方阵会影响效率,据我所知,长矛也就六尺来长,那站在方阵后方的战士都在干什么呢

耶鲁公开课 - 古希腊历史简介课程节选

The delegations from the other six states of the Deep South -- Arkansas, Florida,Georgia,Louisiana,Mississippi, and Texas -- did the same.

VOA: special.2009.07.09

Also, refer to No. 1 and stash your family photos on the refrigerator and deep-six the extensive pile of magazines in the restroom.

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To be the last dog picked on Tuesday night, an owner might spend deep into the six figures, Dean said.

WSJ: Jason Gay: When Madison Square Garden Raises the Ruff

If these conditions are unacceptable to the Administration and the IMF, Congress should just say no, and deep-six the legislation.

FORBES: Fact and Comment