set down vs dash down

set down and dash down both are verbs.

Word	Noun	Adjective	Verb	Adverb
set down	No	No	Yes	No
dash down	No	No	Yes	No

As verbs, dash down is a hyponym of set down; that is, dash down is a word with a more specific, narrower meaning than set down:

Other hyponyms of set down include transcribe, notate, dash off, note, take down.

set down (verb)	dash down (verb)
put down in writing; of texts, musical compositions, etc.	write down hastily
remove (cargo, people, etc.) from and leave
put or settle into a position
cause to sit or seat or be in a settled position or place
go ashore
reach or come to rest