go pear-shaped

US /ɡoʊ pɛər-ʃeɪpt/
UK /ɡoʊ pɛər-ʃeɪpt/
"go pear-shaped" picture
1.

台無しになる, うまくいかなくなる

if a plan or situation goes pear-shaped, it goes wrong

:
Our plans for the picnic went pear-shaped when it started to rain heavily.
大雨が降り始めたとき、ピクニックの計画は台無しになった
The whole project went pear-shaped because of poor management.
劣悪な管理のせいで、プロジェクト全体が台無しになった