(US) A system for showing theater-quality films at home, usually comprising high-definition television and surround sound. / (by extension) A dedicated room for such a system.

A restaurant, shop or other establishment catering to customers that is particularly inconspicuous and easily overlooked. / (colloquial, chiefly Britain) An automated teller machine (ATM).

Alternative form of up the creek

(idiomatic) To do something pointless or insignificant that will soon be overtaken by events, or that contributes nothing to the solution of a current problem.

(US, idiomatic) To prison.

(slang, vulgar) To chat casually; to gossip.

(idiomatic) In understanding or in the ability to absorb new information; especially in the phrases "quick on the uptake" and "slow on the uptake".

(Britain) The sergeant-at-arms in the House of Lords.

a form of theatre in which the actors perform spontaneously, without a script

(US, idiomatic) Where is the content? So what?