Dictionary / Vocabulary / 大山鳴動
たいざんめいどう
big fuss over nothing; much cry and little wool; much ado about nothing
Also written 泰山鳴動、太山鳴動
大騒ぎした割には、大山鳴動して鼠一匹ということになったようだね。
Everybody was so up in arms but it seems they got all panicky about nothing.
大山鳴動してねずみ一匹。
The mountains have brought forth a mouse.