Answer:
Idiomatic expressions
Step-by-step explanation:
An idiom is a group of words that have its particular meaning that is different from its individual meaning.
For example, "take the bull by the horn" means confronting an unpleasant situation but if we look at the words individually taking the bull by the horn is simply holding a bull's horn.
Another example is "over the moon" which is used to describe when someone is very happy, but looking at the meaning of the individual words, it has no correlation with someone being happy.
So, before à person uses such Idiomatic expressions in a presentation, the person has to make certain that his listeners understand the cultural bound phrases and is not confused.
Idioms are a fun way to communicate, especially if your recipient understands the idioms.