Idioms
An idiom is a type of phrase or expression that has a meaning that can't be deciphered by defining the individual words.
Idiom:
in a world of one's own
Meaning:
in deep thought or concentration, not caring about other people
Example:
The boy is in a world of his own and he does not notice what other people say or think.
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.