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:
run a fever/temperature
Meaning:
to have a body temperature higher than normal
Example:
The little boy was running a fever so his parents decided to call the doctor.
List of common idioms, their meanings and examples of their usage in sentences
An idiom is a group of words, or in other words, a phrase that has a meaning other than its literal meaning of the words in it.