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:
take the initiative to (do something)
Meaning:
to decide to do something although one has not been asked to do it
Example:
I decided to take the initiative to organize a dinner for my friend who was leaving to go to a different university.
List of common idioms, their meanings and examples of their usage in sentences
An idiom is a group of words, or in other words, a phrase that has a meaning different from the literal meaning of the words in it.