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:
play on/upon (something)
Meaning:
to cause an effect on something, to influence something
Example:
The company played on the feelings of loneliness of some people to get them to buy more products.
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.