einnhverr

Etymology
From 🇰🇲.

Pronoun

 * 1) some, someone, something
 * ágætastr maðr einnhverr
 * ágætastr maðr einnhverr

Usage notes
In Old Norse grammars and dictionaries, various forms of einnhverr are often used as case markers, that is stand-ins for other words when discussing the grammatical properties of a verb or even a preposition and their use of case. The word's meaning evidently lends itself well to this purpose. Using the word as a stand-in case marker is, however, a modern invention used to describe Old Norse, and is not necessarily descriptive of its medieval use.

When used as such, the forms may be abbreviated. They are as follows:
 * e-m = einhverjum
 * e-u = einhverju
 * e-n = einhvern
 * e-t = eitthvert
 * e-s = einhvers

Declension
Both its parts, einn and hverr, inflect individually. The first part, however, is generally an indeclinable ein- in all other forms than the masculine nominative singular and the neuter nominative and accusative singular. The last part is inflected more straight forward.