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:
think back on (someone or something)
Meaning:
to remember and think about someone or something in one's past
Example:
When I think back on my school days I always remember my favorite teacher.
List of common idioms, their meanings and examples of their usage in sentences
An idiom is defined as - a group of words whose meaning is different from the meanings of the individual words.