word-forming element meaning "in; into," from French and Old French en-, from Latin in- "in, into" (from PIE root *en "in"). Typically assimilated before -p-, -b-, -m-, -l-, and -r-. Latin in- became en- in French, Spanish, Portuguese, but remained in- in Italian.
Also used with native and imported elements to form verbs from nouns and adjectives, with a sense "put in or on" (encircle), also "cause to be, make into" (endear), and used as an intensive (enclose). Spelling variants in French that were brought over into Middle English account for parallels such as ensure/insure, and most en- words in English had at one time or another a variant in in-, and vice versa.
Old English scrin "ark (of the covenant); chest, coffer; case for relics," from Latin scrinium "case or box for keeping papers," of unknown origin. From late 14c. as "a tomb of a saint" (usually elaborate and large). A widespread word, compare Dutch schrijn, German Schrein, French écrin, Russian skrynya, Lithuanian skrinė.
<a href="https://www.etymonline.com/word/enshrine">Etymology of enshrine by etymonline</a>
Harper, D. (n.d.). Etymology of enshrine. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/enshrine