The tail end 就是某物或某事的末端或结尾。

例句

The tail end of the storm caused the most damage.

She didn't thank her colleagues until the tail end of her long leaving speech.

We didn't find out the name of the killer until the tail end of the story.

请注意

如果你做某事最后的结局是 your tail between your legs 的状态，就是说你做某事失败了或者是做错了，非常尴尬难堪、无地自容的状态。

例句

Tom left the meeting with his tail between his legs after failing to impress the staff with his plans for the future.