Idioms are for emphasis and interest. Using an idiom instead of just a phrase is more colorful. It sounds more interesting that way. It also adds more emphasis to what you say.
Example:
I felt very anxious waiting for the doctor. --- OR ---
I was on pins and needles waiting for the doctor
an idiomatic expression
idiom is a type of slang. so to say that something has an idiomatic expression, means that it uses slang words. so "get his act together" is idiomatic as its using slang words (act) to represent meanings of other words, as act is referring to the way he presents himself or maybe his lifestyle choices.
idiomatic expression
"Turn a deaf ear" is an idiomatic expression meaning to ignore or pay no attention to something.
The expression "Keep it dark" refers to telling someone to keep a secret. The phrase uses the imagery of staying in the dark as something that should remain unseen.
Idiomatic expression
humbly
"You" is not an idiom. It is a pronoun.
Jasjs
Give me 1 example of idiomatic expression
This expression means real and simple.
yes it is