Idioms
A group of words which have a different meaning when used together from the one they would have if you took the meaning of each word separately.
Idiom:
religious about (doing something)
Meaning:
to be strict about doing something
Example:
My father is religious about brushing his teeth before he goes to bed at night.
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 other than its literal meaning of the words in it.