word forming element indicating "oneself," also "automatic," from Old English use of self (pron.) in compounds, such as selfbana "suicide," selflice "self-love, pride, vanity, egotism," selfwill "free will." Middle English had self-witte "one's own knowledge and intelligence" (early 15c.).
OED counts 13 such compounds in Old English. Middle English Compendium lists four, counting the self-will group as a whole. It re-emerges as a living word-forming element mid-16c., "probably to a great extent by imitation or reminiscence of Greek compounds in (auto-)," and formed a great many words in the pamphlet disputes of the 17c.
c. 1500, deprecacioun, "prayer to avert evil, earnest desire for exemption or deliverance," from Old French deprecation and directly from Latin deprecationem (nominative deprecatio) "a warding off or averting by prayer," noun of action from past-participle stem of deprecari "plead in excuse; avert by prayer," literally "to pray (something) away," from de "away" (see de-) + precari "to pray" (from PIE root *prek- "to ask, entreat"). Sense of "disapproval, earnest expression of feeling against" is by 1610s.
<a href="https://www.etymonline.com/word/self-deprecation">Etymology of self-deprecation by etymonline</a>
Harper, D. (n.d.). Etymology of self-deprecation. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/self-deprecation