Idioms
Idioms are phrases which cannot be understood simply by looking at the meaning of the individual words in the phrase.
Idiom:
a hard-and-fast rule
Meaning:
a rule that cannot be altered to fit special cases
Example:
There is no hard-and-fast rule that says you cannot use a cell phone on the bus.
List of common idioms, their meanings and examples of their usage in sentences
An idiom is a type of phrase or expression that has a meaning that can't be deciphered by defining the individual words.