A1 used to mean an object without saying its name: I need to get a few things in town.
A2 a fact or characteristic of someone or something: The best thing about the holiday was the food.
a thing B1 used instead of ‘anything’ in order to emphasize what you are saying: I haven’t got a thing to wear.
› used to refer to an idea or comment: I just want to forget the whole thing.
› used to refer to an activity or event: Meeting Nina was the best thing that’s ever happened to me.
thing to do/say › something that is done or said: What a silly thing to do.