Definition of a thing
: anything —used in negative statements <I can't see a thing without my glasses on.> <The guests will be here soon, and I don't have a thing (that is appropriate) to wear.> <Don't worry about a thing. I'll take care of everything.> <She doesn't look a thing like her older sister.> <His new album doesn't sound a thing like his last one.>
Word by Word Definitions
: a matter of concern : affair
: state of affairs in general or within a specified or implied sphere
: a particular state of affairs : situation
Seen and Heard
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