LOOK[C]›the look on someone's face showing what they feel or think: your facial expressionHe had a sad expression on his face.
PHRASE[C]›a phrase that has a special meaning: 'A can of worms' is an expression meaning a difficult situation.
SHOWING THOUGHTS[C, U]›when you say what you think or show how you feel using words or actions: As an expression of our disapproval, we will no longer use his shop.