Cách sử dụng
The expression "pencil in" is used when you want to make a tentative or temporary plan for something. You would use this expression when you are not sure if the plan will definitely happen, but you want to make a note of it so you can try to do it later. For example, if a friend asks you to join them for dinner next Friday but you are not sure if you can make it, you could say "Let me pencil in next Friday for dinner and I'll let you know for sure closer to the date." This means that you are not confirming the plan, but you are making note of it in case you can do it.