Depress
late Middle English: from Old French depresser, from late Latin depressare, frequentative of deprimere ‘press down’.
wiktionary
From Middle English depressen, from Old French depresser, from Latin dēpressus, perfect participle of dēprimō(“to press down, to weigh down”), from dē-(“off, away, down, out”) + premō(“to press”).
etymonline
depress (v.)
late 14c., "put down by force, conquer," a sense now obsolete, from Old French depresser "to press down, lower," from Late Latin depressare, frequentative of Latin deprimere "press down," from de "down" (see de-) + premere "to press, hold fast, cover, crowd, compress" (from PIE root *per- (4) "to strike").
Meaning "push down physically, press or move downward" is from early 15c.; that of "deject, make gloomy, lower in feeling" is from 1620s; economic sense of "lower in value" is from 1878.
