matter|matter Thành ngữ, tục ngữ
as a matter of fact|fact|matter|matter of fact
adv. phr. Actually; really; in addition to what has been said; in reference to what was said.

Often used as an interjection.
It's not true that I cannot swim; as a matter of fact, I used to work as a lifeguard in Hawaii. Do you think this costs too much? As a matter of fact, I think it is rather cheap.
no matter|matter
1. Not anything important.
I wanted to see him before he left but it's no matter. 2. It makes no difference; regardless of.
She was going to be a singer no matter what difficulties she met. He had to get the car fixed no matter how much it cost. No matter what you try to do, it is important to be able to speak well. You can't go in no matter who you are. Mary wanted to get to school on time, no matter if she went without breakfast.
the matter|matter
adj. Not as it should be; wrong.

Used in questions or with negatives or "if".
Why don't you answer me? What's the matter? John may be slow in arithmetic, but nothing's the matter with his pitching arm. If anything is the matter, please tell me.