a single matter as distinct from another, typically used in contrastive structures

two unrelated or quite different matters

quite impressive; not bad at all

to regard something as important, significant, or worthy of attention, often used in negative constructions to suggest indifference

the explanation for how a situation came about or what it is all about

an idiom used to ask about the reason or nature of a situation, event, or incident, equivalent to 'what is going on' or 'what is the matter'.

To not take something seriously; to regard as unimportant.