Phrase, expression (5)
I believe the answer is:
idiom
I believe this is a double definition.
'phrase' is the first definition.
(I know that phrase can be written as idiom)
'expression' is the second definition.
(I know that idiom is a type of expression)
(Other definitions for idiom that I've seen before include "Expression that's characteristic of particular group" , "Characteristic style of expression" , "Local style of expression" , "Colloquialism" , "'Break a leg' or 'miss the boat'" .)