go pear-shaped
US /ɡoʊ pɛər-ʃeɪpt/
UK /ɡoʊ pɛər-ʃeɪpt/
1.
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.
•
The whole project went pear-shaped because of poor management.