Idioms
An idiom is a group of words, or in other words, a phrase that has a meaning other than its literal meaning of the words in it.
Idiom:
instrumental in (doing something)
Meaning:
playing an important part in doing something
Example:
Our teacher was instrumental in getting the school to change their policy on using the library after school.
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.