Idioms
An idiom is a type of phrase or expression that has a meaning that can't be deciphered by defining the individual words.
Idiom:
up a blind alley
Meaning:
on a route that leads nowhere, at a dead end
Example:
The police were up a blind alley in their search for evidence of the crime.
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