An expression in the usage of a language that is peculiar to itself either in having a meaning that cannot be derived from the conjoined meanings of its elements or in its grammatically atypical use of words.
Idiom:
count (someone) out or count out (someone)
Meaning:
to exclude someone from something
Example:
"Please count me out of your plans to go skiing this weekend."
List of common idioms, their meanings and examples of their usage in sentences
Idioms can be a powerful linguistic tool only when they are used in the right way in the right places.