(idiomatic) What is wrong? What's the problem? / (dated) What's happening? What's the news?

a fact / (idiomatic) a more factual correction / (idiomatic) something completely true

(American spelling) Alternative spelling of grey matter

A mattress that is inflated with air, and used as a temporary or permanent bed.

A fact or statement that is recorded in governmental records or in publications. / (law) A fact that is contained within court files or has otherwise been entered into evidence before the court.

simple past tense and past participle of mat

forming a thick tangled mess / covered with mats or matting

plural of matter

Third-person singular simple present indicative form of matter

(neuroanatomy) A region of the central nervous system containing myelinated nerve fibres and no dendrites