Definition from macmillandictionary.com
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Teachers feel this is a matter for discussion with parents.
an extremely important matter
You look sad. What’s the matter?
What’s the matter with the car?
I think there’s something the matter with the printer.
There’s nothing the matter with you – you’re just tired.
Her angry attitude didn’t improve matters.
The parcel arrived late and, to make matters worse, it wasn’t what we had ordered.
You can improve the soil by adding composted organic matter.
The school could close in a matter of a few weeks.