大たい山ざん鳴めい動どう

Meanings

1

noun, noun or participle which takes 'suru', intransitive verb

much ado about nothing; big fuss over nothing

yojijukugo (four-character idiom)

A yojijukugo meaning a great uproar that leads to a trivial result. Often used in the full phrase 大山鳴動して鼠一匹 (the mountain labors and brings forth a mouse).

結けっ局きょく、大たい山ざん鳴めい動どうで終おわった。
In the end, it was much ado about nothing.

大たい山ざん鳴めい動どうして鼠ねずみ一いっ匹ぴきとは、まさにこのことだ。

This is exactly a case of 'the mountain labors and brings forth a mouse.'