Idioms
The language peculiar to a people or to a district, community, or class
Idiom:
know (someone or something) like a book
Meaning:
to know someone or something very well
Example:
I know the personality of my friend like a book.
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.