the tail wagging the dog

US /ðə teɪl ˈwæɡɪŋ ðə dɔɡ/
UK /ðə teɪl ˈwæɡɪŋ ðə dɔɡ/
"the tail wagging the dog" picture
1.

本末倒置, 喧賓奪主

a situation in which a small or less important part of something controls or dominates the whole thing

:
Allowing a minor issue to dictate the entire project budget is a classic case of the tail wagging the dog.
讓一個小問題決定整個項目預算,是典型的本末倒置
In this company, it often feels like the tail is wagging the dog, with junior staff making decisions for senior management.
在這家公司,常常感覺是本末倒置,初級員工為高級管理層做決策。