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:
steal a march on (someone)
Meaning:
to get an advantage over someone without being noticed
Example:
I was able to steal a march on my colleague when he was away on vacation.
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.