Y/N grabbed their keys and left the room.

[L]et us perform a good knife and fork as helluones librorum at those two magnificent repositories of legible or illegible rarities. Here we may feast on Editiones Principes, Uniques on vellum, books without date or place, literary frauds, colophons, catchwords, and dainties, as the ballad has it, 'past expression.'

A term should be included if it's likely that someone would run across it and want to know what it means. This in turn leads to the somewhat more formal guideline of including a term if it is attested and idiomatic.

Epilepsies, or fallings and reelings, and beastly vomitings. The least of these, even when the tongue begins to be untied, is a degree of drunkenness.