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:
give (someone) a clean bill of health
Meaning:
to declare that someone is healthy (usually done by a doctor)
Example:
My doctor gave me a clean bill of health during my recent checkup.
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.