the feeling of being heavily burdened, mentally or physically, by troubles, adverse conditions, anxiety, etc.
Origin: 1300–50; Middle English oppressioun < Middle French < Latin oppressiōn- (stem of oppressiō) a pressing down, equivalent to oppress(us) (see oppress) + -iōn--ion
mid-14c., "cruel or unjust use of power or authority," from Fr. oppression (12c.), from L. oppressionem (nom. oppressio), noun of action from pp. stem of opprimere (see oppress). Meaning "action of weighing on someone's mind or spirits" is from late 14c.