Accomplish
late Middle English: from Old French acompliss-, lengthened stem of acomplir, based on Latin ad- ‘to’ + complere ‘to complete’.
wiktionary
From Middle English accomplisshen, acomplissen, from Old Frenchacompliss-, extended stem of acomplir (Modern French accomplir), [1] from a-(“to”) (from Latin Latin ad) + complir (or possibly through a Vulgar Latin root *accomplīre, with inchoative *accomplesco), from Vulgar Latin *complīre and *complesco, from Latin complēre(“to fill up, fill out, complete”); see complete.
First attested in the late 14th century.
etymonline
accomplish (v.)
late 14c., "fulfill, perform, carry out an undertaking," from Old French acompliss-, present participle stem of acomplir "to fulfill, fill up, complete" (12c., Modern French accomplir), from Vulgar Latin *accomplere, from Latin ad "to" (see ad-) + complere "to fill up," transferred to "fulfill, finish (a task)," from com-, here probably as an intensive prefix (see com-), + plere "to fill" (from PIE root *pele- (1) "to fill"). Related: Accomplished; accomplishing.
