Cách sử dụng
The expression "pin down" means to get a clear and specific answer or explanation on something. For example, if you want to find out when a meeting is taking place, you might ask someone to pin down the exact date and time for you. Or if you want to understand a difficult concept, you might need to pin down the details from a textbook or a teacher. The expression can be used in many different contexts, but it's always about being specific and precise in your understanding of something.