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:
bargain for (something)
Meaning:
to anticipate something, to take something into account
Example:
The difficulty of the job was more than I had bargained for.
List of common idioms, their meanings and examples of their usage in sentences
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.