Assist
late Middle English: from Old French assister, from Latin assistere ‘take one's stand by’, from ad- ‘to, at’ + sistere ‘take one's stand’.
wiktionary
From Middle English assisten, from Old French assister(“to assist, to attend”), from Latin assistō(“stand at, bestand”, verb).
etymonline
assist (v.)
early 15c., assisten, "to help, aid, give assistance or support to in some undertaking or effort," from Old French assister "to stand by, help, put, place, assist" (14c.), from Latin assistere "stand by, take a stand near, attend," from assimilated form of ad "to" (see ad-) + sistere "stand still, take a stand; to set, place, cause to stand," from PIE *si-st-, reduplicated form of root *sta- "to stand, make or be firm." Related: Assisted; assisting. Medical assisted suicide attested from 1884.
assist (n.)
1570s, "an act of assistance," from assist (v.). In the sporting sense attested 1877 in baseball, 1925 in ice hockey.
