Idioms:
a group of words established by usage as having a meaning not deducible from those of the individual words.
Expressions:
	
	
	
	
the action of making known one's thoughts or feelings.
	
	
	
	
	
	
	
a look on someone's face that conveys a particular emotion.
	
	
	
	
	
	
	
a word or phrase, especially an idiomatic one, used to convey an idea.
	
	
	
	
	
	
	
the production of something by pressing it out.