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.
answer to (someone)
to explain or justify one's actions to someone
The manager had to answer to the company president about the financial problems.
List of common idioms, their meanings and examples of their usage in sentences
Idioms are phrases which cannot be understood simply by looking at the meaning of the individual words in the phrase.