Select the most appropriate meaning of the given idiom.

A feather in the cup

A very good achievement

The most appropriate meaning of the idiom "a feather in the cap" is a very good achievement. This idiom comes from the practice of warriors adding a feather to their cap for every enemy they defeated. In the same way, a "feather in the cap" is something that you can be proud of, such as a successful accomplishment or a positive recognition.

The other options are not as accurate or appropriate. To be strong means to be physically or mentally strong. In disorder means in a state of chaos or confusion. To show fear means to express fear or apprehension.