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:
look good on paper
Meaning:
to appear to be a good plan (but in actual practice it may not be a good plan)
Example:
My supervisor's plan looks good on paper but in reality I do not think that it will be successful.
List of common idioms, their meanings and examples of their usage in sentences
The language peculiar to a people or to a district, community, or class