to reduce or lower, as in rank, office, reputation, or estimation; humble; degrade.
2.
Archaic, to lower; put or bring down: He abased his head.
Origin: 1470–80; a-5 + base2; replacing late Middle English abassen, equivalent to a-5 + basbase2; replacing Middle English abaissen, abe(i)sen < Anglo-French abesser, abaisser,Old French abaissier, equivalent + a-a-5 + -baissier < Vulgar Latin *bassiare, verbal derivative of Late Latin bassus;see base2
late 14c., abaishen, from O.Fr. abaissier "diminish, make lower in value or status," from V.L. *ad bassiare "bring lower," from L.L. bassus "thick, fat, low;" from the same source as base (adj.) and altered in Eng. by influence of it, which made it an exception to the rule