Idioms
An idiom is defined as - a group of words in a fixed order that has a particular meaning that is different from the meanings of each word on its own.
Idiom:
act as a guinea pig
Meaning:
to allow some kind of test to be performed on someone
Example:
I was not happy to act as a guinea pig on the new training material.
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.