UPHOLDER

upholder, maintainer, sustainer

(noun) someone who upholds or maintains; “firm upholders of tradition”; “they are sustainers of the idea of democracy”

Source: WordNet® 3.1

Etymology

Noun

upholder (plural upholders)

someone who upholds something

(obsolete) a dealer in secondhand furniture and clothes; an upholdster

Source: Wiktionary

Up*hold"er, n. Etym: [Up + holder. Cf. Upholsterer.]

1. A broker or auctioneer; a tradesman. [Obs.]

2. An undertaker, or provider for funerals. [Obs.] The upholder, rueful harbinger of death. Gay.

3. An upholsterer. [Obs.]

4. One who, or that which, upholds; a supporter; a defender; a sustainer.

Source: Webster’s Unabridged Dictionary 1913 Edition