An expression in the usage of a language that is peculiar to itself either in having a meaning that cannot be derived from the conjoined meanings of its elements or in its grammatically atypical use of words.
Idiom:
get a whiff of (something)
Meaning:
to learn a little about something (almost by chance)
Example:
Whenever the reporters get a whiff of a scandal they start asking questions.
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.