Immerse

google

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early 17th century: from Latin immers- ‘dipped into’, from the verb immergere, from in- ‘in’ + mergere ‘to dip’.

wiktionary

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Borrowed from Latin immersus, from immergō, from in + mergō.

etymonline

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immerse (v.)

"to plunge into (a fluid)," early 15c. (implied in immersed), from Latin immersus, past participle of immergere "to plunge in, dip into, sink, submerge" (see immersion). Figuratively, of study, work, passion, etc., from 1660s. Related: Immersed; immersing; immersive.