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“immerse” in Latin

The English word immerse itself goes back to Latin in, through immersus.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

immerse
PROPR., immergere (e.g., immersus in flumen, Cic.): mergere (in aliquid; aliqua re): demergere (in aliquid; [in] aliqua re; e.g., in palude demersus; in fossas... demersus): submergere (aliqua re; submersus voraginibus). To be immersed, mergi: immergi.
IMPROPR., demergere (e.g., in debt, aere alieno demersus): mergere (e.g., aliquem malis, Verg.; se in voluptates, Liv.): immergere (e.g., studiis, Sen.). ☞ It is better to say alicui rei se totum dedere than alicui rei se immergere, after se studiis immergere (Sen.): ☞ submergere, IMPROP., is very rare and post-classical, virtus submersa tenebris (Claudius). Immersed in debt, aere alieno demersus (Liv.) or obrutus [Vid: DEBT]: to be immersed in pleasures, mergi in voluptates (Curt.); avide in voluptates se mersisse (Liv., 23, 18); in a train of thought, se totum in alicujus rei cognitione collocare: immersed in business, occupationibus or negotiis implicatus, or negotia, occupationes, etc., multis officiis implicatum et constrictum tenent aliquem: to be immersed in litterary pursuits, in litteras or litteris (ablative) se abdere (abdidisse).

Quick answer

What is the Latin word for immerse?
The usual Latin words for “immerse” are immergō, mergō, dēmergō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.