Cách sử dụng
The expression "a feather in your cap" means an accomplishment or achievement that you can be proud of. It comes from the tradition where warriors would add a feather to their hat or cap for each successful battle or achievement. In modern times, the expression is used to describe any accomplishment or success that you can be proud of. For example, if you become the top scorer in your class, it would be a feather in your cap.