SUBJECT [C] › a subject or situation that you need to think about, discuss, or deal with: I've been thinking about this matter for a long time. He denied any knowledge of the matter. To make matters worse, our car broke down!
SUBSTANCE [U] › the physical substances that exist in the universe
TYPE OF THING [U] › a particular type of substance or thing: vegetable matter printed matter
what's the matter › used to ask or talk about the reason for a problem: What's the matter with your leg? I can't help you if you won't tell me what the matter is.
there's something/nothing the matter › used to say that there is/is not a problem: There's something the matter with the washing machine.
a matter of days/weeks/feet, etc › used in expressions describing how small an amount or period of time is: The aircraft missed each other by a matter of feet.
a matter of confidence/luck/waiting, etc › If something is a matter of confidence/luck/waiting, etc, that is what you need for it to happen: Learning languages is just a matter of hard work.
no matter how/what/when, etc › used to emphasize that something cannot be changed: I never manage to lose any weight, no matter how hard I try.
as a matter of fact › used to emphasize that something is true, especially when it is surprising: As a matter of fact, I used to live next door to him.
a matter of course › If something happens as a matter of course, it always happens as part of the normal process or system: Babies were tested for the disease as a matter of course.
a matter of life and/or death › a serious situation where people could die: Getting water to these people is a matter of life and death.
it's only a matter of time › If you say that it is only a matter of time before something happens, you are sure it will happen but you do not know when. → See also subject matter