Idioms
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.
Idiom:
mix up (something) or mix (something) up
Meaning:
to confuse things, to make a mistake about something
Example:
The teacher mixed up the DVDs and played the wrong one for the class.
List of common idioms, their meanings and examples of their usage in sentences
An idiom is a type of phrase or expression that has a meaning that can't be deciphered by defining the individual words.