go south

US /ɡoʊ saʊθ/
UK /ɡoʊ saʊθ/
"go south" picture
1.

ir mal, dar errado, fracassar

to deteriorate, fail, or go wrong

:
Their business started to go south after the economic downturn.
O negócio deles começou a ir mal após a desaceleração econômica.
The plan seemed good at first, but then everything started to go south.
O plano parecia bom no início, mas depois tudo começou a dar errado.