ˈsuch and ˌsuch pronoun, predeterminer spoken
used to talk about a particular thing, time, amount etc without saying exactly what it is:
They will ask you to come on such and such a day, at such and such a time.

[TahlilGaran] Dictionary of Contemporary English ▲

such and such
someone or something whose name has been forgotten or should not be said
My friend is always trying to borrow such and such from me but I always say no.

[TahlilGaran] English Idioms Dictionary ▲

such and such
pron. Something whose name is not mentioned because it does not need to be mentioned.
George's argument tries to prove such and such to be true, but it does not convince me.

[TahlilGaran] English Idioms Dictionary ▲

such and such
adj. phr. Being one whose name has been forgotten or whose name does not need to be mentioned.
She told me to go to such-and-such a street and turn right.
Suppose, now, that we have such-and-such a group coming to the school, and we don't have enough chairs. What do we do then?

[TahlilGaran] English Idioms Dictionary ▲