An idiom is defined as - a group of words in a fixed order that has a particular meaning that is different from the meanings of each word on its own.
Idiom:
work wonders (with someone or something)
Meaning:
to be very beneficial to someone or something
Example:
The vacation in Egypt worked wonders on the mental health of our boss.
List of common idioms, their meanings and examples of their usage in sentences
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.