soothe (v.)

"truth, reality, fact," Old English soð "truth, justice, righteousness, rectitude; reality, a true situation, certainty," noun use of soð (adj.) "true, genuine, real; just, righteous," originally *sonð-, from Proto-Germanic *santhaz (source also of Old Norse sannr, Old Saxon soth, Old High German sand "true," Gothic sunja "truth"). Compare forsooth.

The group is related to Old English synn "sin" and Latin sontis "guilty" (truth is related to guilt via "being the one;" see sin (v.)), from PIE *hes-ont- "being, existence," thus "real, true" (from present participle of root *es- "to be"), also preserved in Latin sunt "they are" and German sind.

Archaic in English, it is the root of modern words for "true" in Swedish (sann) and Danish (sand). It was in common use until mid-17c. then obsolete until revived as an archaism early 19c. by Scott, etc. It was used for Latin pro- in translating compounds into Old English, such as soðtacen "prodigy," soðfylgan "prosequi."

1590s, "flattering," a sense now obsolete, present-participle adjective from soothe (v.). The sense of "mollifying" is attested by 1746. Related: Soothingly.

Proto-Indo-European root meaning "to be."

It forms all or part of: absence; absent; am; Bodhisattva; entity; essence; essential; essive; eu-; eucalyptus; Eucharist; Euclidean; Eudora; Eugene; eugenics; eulogy; Eunice; euphemism; euphoria; euthanasia; homoiousian; improve; interest; is; onto-; Parousia; present (adj.) "existing at the time;" present (n.2) "what is offered or given as a gift;" proud; quintessence; represent; satyagraha; sin; sooth; soothe; suttee; swastika; yes.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit asmi, Hittite eimi, Greek esti-, Latin est, Old Church Slavonic jesmi, Lithuanian esmi, Gothic imi, Old English eom, German ist.