The idiom "a notch above" means to be of a higher quality or standard than something else. It is often used to compare two things or people, with the one that is "a notch above" being considered better or superior.
For example, if someone says that a particular restaurant is "a notch above" the rest, they mean that it is better than other restaurants in terms of food quality, service, ambiance, etc. Similarly, if someone says that a particular employee is "a notch above" the others, they mean that the employee is better than others in terms of skills, work ethic, attitude, etc.
You can use this idiom in various situations where you want to express that something or someone is superior to others. It is a casual expression and is commonly used in everyday conversations. However, it is important to use it appropriately and not overuse it, as it may lose its impact if used too frequently.
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