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:
lay waste (to something) or lay (something) to waste
Meaning:
to destroy and leave something in ruins, to wreck something
Example:
The army laid waste to the enemy territory.
List of common idioms, their meanings and examples of their usage in sentences
The language peculiar to a people or to a district, community, or class