The idiom "at wit's end" means to be extremely frustrated, confused, or anxious because you have tried everything you can think of to solve a problem, but nothing seems to work.
For example, if you have been trying to fix a broken computer for hours and nothing seems to be working, you might say "I'm at my wit's end with this computer!" This means that you are feeling very frustrated and don't know what else to do.
The phrase "wit's end" comes from an old English word "wit," which means "knowledge" or "understanding." So, when you say you are at your wit's end, you are saying that you have exhausted all of your knowledge and ideas and don't know what else to do.
Overall, this idiom is used when you feel like you have reached the limit of your ability to deal with a difficult situation and you don't know what else to do.
• After trying every possible solution, she was at her wit's end with the broken computer. (feeling frustrated)
• The doctor was at her wit's end trying to cure the rare disease. (feeling challenged)
• The parents were at their wit's end trying to calm their crying baby. (feeling desperate)
• The detective was at his wit's end trying to solve the complicated case. (feeling perplexed)
• I am at wit's end with this math problem. (feeling helpless)
• The team was at their wit's end after losing their fifth consecutive game. (feeling defeated)