Idioms
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.
Idiom:
think on one's feet
Meaning:
to think or reason or plan while one is talking
Example:
My boss can think on her feet and she can easily handle most problems.
List of common idioms, their meanings and examples of their usage in sentences
Idioms can be a powerful linguistic tool only when they are used in the right way in the right places.