condescend
adj.
mid-14c., "to yield deferentially," from Old French condescendere (14c.) "to agree, consent, give in, yield," from Late Latin condescendere "to let oneself down," from Latin com- "together" (see com-) + descendere "descend" (see descend). Sense of "to sink willingly to equal terms with inferiors" is from mid-15c.
〔李〕[con-(com-);descend] v.俯就，屈尊； 堕落到做（下流事） ←scand,scans,scend,scens (L scandere, scansum)=to climb 攀
〔蒋〕[con-表示加强意义，descend下降→卑→谦] 谦逊，俯就，屈尊