Etymology
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Words related to endorse

en- (1)
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.
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dorsal (adj.)

in anatomy, "of or pertaining to the back," late 14c., from Old French dorsal (14c.) or directly from Medieval Latin dorsalis, corresponding to Latin dorsualis "of the back," from dorsum "back," which is of uncertain origin. Related: Dorsally.

endorsement (n.)
1540s, from endorse + -ment. Figurative use from 1630s. Earlier endosement (early 15c.).
indorse (v.)
see endorse. Indorser was old slang for "a sodomite" (1785).