be the matter

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Related to be the matter: States of matter, Phases of matter

be the ˈmatter (with somebody/something)

be the reason for unhappiness, pain, problems, etc: What’s the matter, Gail? You look ill.John’s been very quiet recently. I wonder if there’s anything the matter with him.Don’t worry, there’s nothing the matter.There’s something the matter with this radio. It’s stopped working.
See also: matter