a thingB1[S]›used instead of 'anything' or 'everything' to emphasize what you are saying: Don't worry about a thing (= anything). I'll take care of it.Something, anything, nothing, and everythingnot a (single) thingB2not anything: After the guests had gone, there wasn't a thing left to eat.Something, anything, nothing, and everythingnot have a thing to wearB1(alsohave nothing to wear)humorous›to have no clothes that are suitable for an occasion: I'm going to a wedding on Saturday and I don't have a thing to wear.Wearing clothesthere isn't a thing you can do›you cannot do anything: He broke his promise and there wasn't a thing we could do about it.Something, anything, nothing, and everything