The idiom "head south" means to go in a direction that is opposite to the north or to go in a direction that is considered to be negative or unfavorable.
For example, if someone says, "Things started to head south when the company lost its biggest client," it means that the situation started to become worse or negative after the company lost its biggest client.
Similarly, if someone says, "I was planning to go to the beach, but the weather headed south and it started raining," it means that the weather became unfavorable and it started raining, which ruined the plan to go to the beach.
In general, this idiom is used to describe a situation that is going in the wrong direction or becoming negative. It is a casual and informal expression that is commonly used in everyday conversation.
• I was feeling confident about my presentation, but when I started to stumble over my words, I knew things were about to head south.
• The political situation in the country has been deteriorating rapidly, and many fear that it will only continue to head south.
• I had high hopes for our relationship, but when I discovered that my partner was hiding something from me, I knew that things were about to head south.
• The company's profits have been heading south for the past few quarters, and they need to find a way to turn things around.
• I was excited to go on a road trip, but everything started to go wrong when our car broke down and our plans headed south.
• My GPS stopped working, and I accidentally headed south instead of north.