cast down vs get down

cast down and get down both are verbs.

Word	Noun	Adjective	Verb	Adverb
cast down	No	No	Yes	No
get down	No	No	Yes	No

As verbs, cast down and get down are synonyms defined as:

Other synonyms of cast down include deject, demoralise, demoralize, depress, dismay, dispirit.

cast down (verb)	get down (verb)
lower someone's spirits; make downhearted	take the first step or steps in carrying out an action
	put down in writing; of texts, musical compositions, etc.
	pass through the esophagus as part of eating or drinking
	lower someone's spirits; make downhearted
	move something or somebody to a lower position
	alight from (a horse)
	lower (one's body) as by kneeling