go south

go south (American, informal)

to lose value or quality. When oil prices went south, it caused problems right across the economy. She played well in the tennis championships, except her serve seemed to have gone south.

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go south

1. to lose value or quality. She decided to sell her stocks at the end of the year because she felt the market was going south.

2. to stop working. Ralph was on a business trip to New York when his laptop computer went south.