An idiom is a widely used saying or expression containing a figurative meaning that differs from the phrase's literal meaning.
Idiom:
look up (something) or look (something) up
Meaning:
to search for something in a dictionary or other book
Example:
I will look up my friend's name in the telephone book. I looked up the word in the dictionary.
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.