It would mean that you put a feather into a cup. Perhaps you mean "a feather in your cap," which was a way of showing an achievement and has come to mean any achievement.
Literal meaning is in a fine plumage, the idiom means well dressed; of an excellent appearance
It's not an idiom - it means a cup with some tea in it. NOT your cup of tea, however, is an idiom - it means that something is not to your liking or preference.
"To be" is not an idiom - it's a verb.
Birds of a feather flock together, but all birds cannot fly.
Pest is not an idiom. It's a word.
"The cup of coffee" is not an idiom that I know of. It just means a cup full of coffee.
Literal meaning is in a fine plumage, the idiom means well dressed; of an excellent appearance
idiom is like discribe e.g as light as a feather
It's not an idiom - it means a cup with some tea in it. NOT your cup of tea, however, is an idiom - it means that something is not to your liking or preference.
"To be" is not an idiom - it's a verb.
Birds of a feather flock together, but all birds cannot fly.
Similar to each other; of the same source.
Pest is not an idiom. It's a word.
It is a feather in your cap to answer a million questions on Answers.He told me that it was a feather in my cap to sell my story.It was a feather in my cap to have my garden featured in the Chicago Tribune.
The idiom "apple shiner" means the teacher's pet.
The meaning of the idiom in the pink of health means being in good health.
It's not an idiom - to cope means to deal with, or to handle