depress

Concise Oxford English Dictionary © 2008 Oxford University Press:
depress/dɪˈpres/

▶verb

• 1 cause to feel utterly dispirited or dejected.

• 2 reduce the level of activity in (a system).

• 3 push or pull down into a lower position.

– derivatives
depressible adjective.

– origin ME: from OFr. depresser, from late L. depressare, frequentative of deprimere ‘press down’.