press down vs depress

press down and depress both are verbs.

Word	Noun	Adjective	Verb	Adverb
press down	No	No	Yes	No
depress	No	No	Yes	No

As verbs, press down and depress are synonyms defined as:

press down (verb)	depress (verb)
press down	lessen the activity or force of
	press down
	cause to drop or sink
	lower someone's spirits; make downhearted
	lower (prices or markets)