Cách sử dụng
The expression "mug up on" means to study or learn something a lot more than you usually would in a short period of time. It can be used when you need to quickly learn something for a specific purpose, such as before a test or an important meeting. For example, you might say "I need to mug up on my Spanish before my trip to Spain next week." It's a casual way to express that you need to put in some extra effort to really focus on learning something.