Idioms
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.
Idiom:
on a fool's errand
Meaning:
involved in a useless journey or task
Example:
I was on a fool's errand as I looked for a store that sold organic candy.
List of common idioms, their meanings and examples of their usage in sentences
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.