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:
take a gander at (someone or something)
Meaning:
to examine someone or something, to take a look at someone or something
Example:
I asked the car mechanic to take a gander at the steering system on my car.
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.