Alternative form of don't teach your grandmother how to suck eggs

(idiomatic) I don't understand any of it; it makes no sense.

(before the noun, idiomatic) Current; recent; the latest. / (idiomatic) Informed about the latest news or developments; abreast.

(idiomatic, obsolete) Used to form idioms meaning "to force someone to work hard or to focus intensely upon their work".

(US, slang, rare) To do something that is impossible or very difficult, with connotations of pointlessness.

Next to; near; towards; as far as. / Capable of. / Ready for. / Willing to participate in. / As much as; no more than. / Until. / For the option or decision of. / Doing; involved in.

(idiomatic) To proceed enthusiastically, vigorously, or expertly.

Alternative spelling of up-to-date

(literally) Fitting the melody of. / (idiomatic) Roughly; about; to the approximate sum or extent of.

You can show someone how to do something, but you can't make them do it.