Yours, Etc.: Origins and Uses of 8 Sign-Offs
mid-14c., "cruel or unjust use of power or authority," from Old French opression (12c.), from Latin oppressionem (nominative oppressio) "a pressing down; violence, oppression," noun of action from past participle stem of opprimere (see oppress). Meaning "action of weighing on someone's mind or spirits" is from late 14c.