Adjectival or attributive form of angels dancing on the head of a pin.

(figuratively) The subject of arcane intellectual speculation; used as an example subject of enquiry the pursuit of which is of no value.

Beelzebub; Satan / (idiomatic, biblical) a ruler over a worthless kingdom; leader of a meaningless microcosm.

(American football) To move the chains. / (idiomatic) To make progress, as used in political and corporate venues to express proactive actions.

(idiomatic) To accept or confront the unpleasant consequences of one's actions.

(idiomatic, pharmacology, medicine) Of drugs, dispensed by a pharmacist without needing a doctor's prescription or other form of compliance.

I agree with that; I support that opinion.

(idiomatic) A traveler.

Offered for sale. / During a real estate auction: going to be sold at that auction, i.e. the bid has reached the vendor's reserve.

(idiomatic) A small and seemingly insignificant addition to a burden that renders it too much to bear; the small thing which causes failure, or causes inability or unwillingness to endure any more of something.