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common average old before
They are clichés.
Cliches are trite expressions that are over-used.
drink the kool-aid 24/7
it is a stereotyped expression. Like everything is fair in love and war.Though such expressions are centuries old but still are valid in today's time
25x+20y=5x(5+4y)
Saying "Good morning, how are you" is such an expression.
I got your impolite expression right here.
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an example of a expression is [7+3] x 20- 7= 13
goodmorning
***MERGE THIS QUESTION*** should be with "What are some examples of idioms" - see Related Question link below