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:
build castles in the air/in Spain
Meaning:
to make plans that are impossible
Example:
The girl is always building castles in the air and none of her plans have any chance to succeed.
List of common idioms, their meanings and examples of their usage in sentences
An idiom is defined as - a group of words whose meaning is different from the meanings of the individual words.